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Page#    1453 FAQs  <<prev  next>>
Feb 15 2016 (23:10)

Entry# 1924     
Technical & Operating Comparison between WAP-7 & WDP-4 on Various Parameters and which one is Economical from every Aspect

★★  Info Update
Feb 15 2016 (22:06)
Blog Post# 1739931-0     
Guest: 7fc2cb96   Added by: xxx  Feb 15 2016 (23:10)
*********WAP-7 VS WDP-4(Electric Speed star VS Diesel Speed star of IR) *******
Question: Operating WAP 7 and WDP4 , which one is more economical, considering cost of maintenance of Over Head Wire and other stuff ?
answer is given by Mr Vignesh Kumar
Ans: Since this question is very specific to two locomotives used in India, let's look into some of the important specifications of both the locos.
Let's look at WAP-7 first --My favorite ;)(Here "My favorite" means Favorite of Mr Vignesh Kumar who gives this Answer)
Gear Ratio: 72:20
Axle load: 20.5t
Power: 6,350 hp (4,740 kW)
Tractive Effort: 36.0t
Weight: 123 ton ((121 long tons; 136 short tons))
Maximum speed Test Speed: 160 km/h (99 mph)
Operational Maximum:140 km/h (87 mph)
Power output Maximum: 6,350 hp (4,735 kW)
Continuous: 6,000 hp (4,474 kW)
**** Some WAP-7 Figures are corrected as these are wrong in the Link Provided below from the Following Link:
click here
Now let's look at WDP4
Engine: GM-EMD 16-710
Transmission: Electric (AC - AC)
Power: 4000hp
Tractive Effort: 27.0t (264.8kN). Some sources say 27.5t (269.8kN)
Weight: 118t
Engine rpm: 950
Weight: 118t
Fuel tank capacity: 6000l
Max Speed: 160-180 km/hr but restricted to 110km/hr
Let's compare Electric Locomotive vs Diesel Locomotive Efficiency
According to O-Keating's The Electric Engine, the major advantage of the electric locomotive engine over diesel engine is that electric engine uses a rather simple and straightforward technology. The electric engine pulls power directly from the power grid and requires only a transformer and a regulator to bring down the power to acceptable levels. Diesel engines on the other hand uses diesel to produce energy, which is then transformed into electricity, and then again into kinetic energy, making them only around 40 percent efficient for the diesel consumed.
IRFCA's Diesel vs Electric debate however argue that the total cycle efficiency of electric engine from power plant to wheels of the engine is much less than the diesel loco.
Electric Locomotive v/s Diesel Locomotive Technology
Electric engines are lightweight, constituting only motors and wheel axles, and have almost no moving parts. Diesel engines on the other hand have a large number of moving parts such as pistons, valves, turbines, and chains. Electric engines are therefore easier to maintain whereas the moving parts of a diesel engine require constant maintenance.
The lightness of the electric engine contributes to lesser wear and tear of the tracks in comparison with the diesel engine. Diesel engines however are capable of 10 percent higher load hauling capability.
The following picture depicts the story for Electric (on the left) and diesel locomotives.
The energy loss for electric locomotives happen at the power station and in transmission and not in the loco itself. As power stations get more efficient these loss too will reduce, making electric more efficient.
Electric locomotives have regenerative braking which feeds back the power when the loco is braking, thus making them even more efficient.
Electric Locomotive v/s Diesel Locomotive Speed
These are the results of the trail runs conducted by Indian Railways.
Note: All trials conducted with a 24-coach 1430 tonne passenger rake
The WDP4 and WAP7 are highlighted in blue. A WAP7 can accelerate quicker than the WDP4. If the the WAP7 is operated on a 25KM route then it will be able to attain a max speed of 120-130km/hr, but it takes 25.66 Kms for the WDP5 to acheive a speed of 110km/hr, meaning on a 25km route it will be able to do a max of 70-80 before it has to slow down again.Electric engines do not produce much heat and noise, meaning that most of the energy produces converts into foreword motion. Diesel engines, on the other hand waste generate much heat and noise, diverting the energy away from forward motion.
Electric motors have the ability to produce as much torque as the power supplied. The primary disadvantage of the diesel locomotive engine is the amount of electricity the diesel engine generates limiting the power supply, making such engines incapable of attaining higher speeds.
The speed record for an electric locomotive engine is 320 mph, and for a diesel locomotive engine 148 mph.
Electric Locomotive v/s Diesel Locomotive Commercial Consideration
A major commercial consideration for railways to prefer electric locomotive engines to diesel locomotive engines is cost and availability of diesel. Diesel is an expensive non-renewable fuel source whereas electricity is a cheaper and infinite source of energy.
The major advantage of the diesel locomotive engine is its ability to work under all conditions and at all terrains, and the major disadvantage of the electric locomotive engine compared to the diesel locomotive engine is the requirement for power supply in the form of overhead electric lines. The capital cost of laying 5 to 6 kilometers of traction wires is equivalent to the cost of a new diesel locomotive. In addition to the cost and difficulties of installing overhead power lines and sub-stations to supply power, the possibility of disruption of train services is always a live concern for the following reasons:
power disruption
damage to the overhead lines or posts supporting the electric lines
The pantograph on top of the locomotive not making proper contact with the electric wires
If the cost of infrastructure needed to setup the overhead lines and sub stations are to be taken into consideration then electric trains are not as efficient as EMD ones.
Diesel locomotive is in fact an Electric Locomotive carrying its own powerhouse. While the earlier versions of the diesel locomotives were indeed inefficient, today’s modern diesel locomotives with Electric transmission have all the benefits of modern technology. For routes with less traffic density it is more efficient to use diesel, as the breakeven point is pretty high.
Source of this Info and attached images: click here
Attached Loco Images:
WAP7-GZB-30241 --- This beautifully repainted WAP7 of Ghaziabad ELS was framed by Sam at NDLS trip shed while it was taking afternoon nap on 11th July 2014.
Link: click here
Courtesy: Sam
WDP4-SGUJ-20003 --- The Siliguri king caught napping at Patna Jn. on east end of PF-2 by Sam on a wet morning of Oct 2013.
Link: click here
Courtesy: Sam
Feb 15 2016 (07:55)

Entry# 1923     
Charm Vanished*^~
Pure Vegetarian Food in Tirupati

Info Update
Feb 14 2016 (21:54)
Blog Post# 1738992-0     
Gopal*^~   Added by: Charm Vanished*^~  Feb 15 2016 (07:55)
********* *********** **************
Pilgrims visiting Tirupati would like to have pious food free of Onion and Garlic. But one will find it scarce and have to look out for those places serving pious food.
Also for a comfortable stay one does'nt have much options except hotels
or lodges where everything is mixed up.
Keeping this in mind Sri. Gopalakrishnan a sishya of Sri Vanamamalai Mutt has started Sri Vaishnava Bhojanam at his residence in Tirupathi along with accomodation facility for pilgrims.
This is a purely residential place and not a hotel or lodge. He serves home cooked pious food and also provides accomodation with decently furnished A/C and Non A/C rooms with all necessary facilities.
All these at a very much affordable budget with Quality Service as the only Motive for the pilgrims.
Those who require food need to order one day in advance. Breakfast, Lunch and Dinner are provided along with evening Tiffin if required.
Those requiring accomodation need to inform well in advance to ensure availability and a comfortable stay.
This service is available on all days of the week. Request to share this and help pilgrims visiting Tirupathi.
For Details Contact:
Sri. K.N. Gopalakrishnan
19-9-7A, Kennedy Nagar,
Near State Bank of Hyderabad
Tirupathi - 517501
Andhra Pradesh
Mobile - 9000677593 & 9440182740
(Forward as received on WhatsApp)
Disclaimer: I have no commercial/other connection whatsoever with this organisation.. Posted for the use of pilgrims who are pure vegetarians and prefer Onion/Garlic Free food(Eg Jain food).They may utilize the services if interested ,after confirmation using the cell nos/Address furnished above.
What are the Govt (CSTC) Buses Via New Alipur Station to different locations of Kolkata City?

Feb 14 2016 (15:21)
Blog Post# 1738715-0     
Durgiana Exp needs LHB Rake with Pantry or Buffet*^~   Added by: Durgiana Exp needs LHB Rake with Pantry or Buffet*^~  Feb 14 2016 (15:31)
List of CSTC (Calcutta State Transport Corporation) Buses Via New Alipur Railway Station Area to various locations of Kolkata (Calcutta) City:-
S-48A -> BBD Bag to Behala Chowrasta (Xing) via Esplanade - Park Street/Jeevan Deep - Rabindra Sadan - Rashbihari More - Chetla - New Alipur - Taratala [This bus may occasionally divert it's route from Rabindra Sadan to Taratala via PTS - Hastings - Khidderpur - DH Road]

7 -> Sarsuna to Howrah via Bakultala - Behala - Taratala - New Alipur - Tollygunje Phari - Rashbihari More - Hazra - Rabindra Sadan - Park Street - Esplanade - BBD Bag - Barabazar
S-4D -> Parnashree to New Town (Sector 5) via Taratala Depot - Taratala Xing - New Alipur - Tollygunje Phari - Lake Gardens - South City Mall - Jadavpur Thana - Kalikapur - Ruby More - Science City - Nicco Park - College More - Technopolis
S-4 -> Salt Lake Gate to Parnashree via Nicco Park - Hudco - Science City - Ruby More - Gariahat - Rashbihari Avenue - Tollygunje Phari - New Alipur - Taratala Xing - Taratala Depot
AC-4A -> Parnashree to Sapoorji Estate via Taratala - New Alipur - Tollygunje Phari - Lake Gardens - South City Mall - Jadavpur Thana - Kalikapur - Ruby More - Science City - Chingri Ghata - Nicco Park - College More - New Town (Sector 5) - Unitech
S-22 -> Karunamoyee Salt Lake to Sakuntala Park via Nicco Park - Chingri Ghata - Science City - Ruby More - Gariahat - Rashbihari More - Chetla - New Alipur - Taratala - Behala Chowrasta - Bakultala
S-46 -> Akra Rabindranagar to Karunamoyee Salt Lake via Santoshpur - Nature's Park - Taratala Xing - New Alipur - Chetla - Rashbihari Avenue - Gariahat - Bijan Setu - Ruby More - Science City - Central Park
S-3W -> Joka to Ecospace via Thakurpukur - Behala - Taratala - New Alipur - Chetla - Rashbihari More - Ballygunj - Ruby More - Science City - Chingri Ghata - Nicco Park - College More - New Town (Sector 5)
S-51 -> Eden City Maheshtala to Garia via Dakghar - Taratala - New Alipur - Chetla - Rashbihari More - Lake Gardens - South City Mall - Jadavpur - Baghajatin
#CSTCandIR - Data seen from Route Finder Page of CSTC Website
Original Image Source of New Alipur 5-Point Crossing Circle
Aug 01 2011 (17:52)

Entry# 407     
What is meant by ISO certification? Which are the ISO certified trains in Indian Railways?

Jan 30 2016 (13:55)
Blog Post# 1724844-1     
Guest: 7fedf496   Added by: moderator*^~  Feb 06 2016 (23:57)
ISO certifications are actually a bunch of guidelines rather they are a bunch of standards designated for a particular purpose, which is provide an assurance to the customer/ organization that the product they are using meet the regulatory required standards for that product. At the same time they also keep the manufacturer in check and prevent them from using unscrupulous means.
Getting an ISO certification is a difficult and a very coveted task. There are several organisations which individually check your product independently and individually certify that your product meets the ISO standard, it is only then that you get a ISO certification.
such an ISO certified product/service usually means that the product is of a pristine quality and will usually give you a good service.
Therefore they become a strong USP for the body.
Shaan-E-Bhopal was the 1st train in IR to be accorded with ISO certification and she is the undoubtably pride of Bhopal.
Easily amongst the cleanest if not the cleanest already :P.
Now to get a ISO certification you have to pay an exorbitant fee first :P.
Then the officials arrive to check your train.
If satisfied you are awarded with the certification if not then 'better luck next time' :xD
Some of the points that they check are:-
1. Maintainance :- They check the maintaining procedure, the sincerity and dedication that goes into the maintaining of the train. The TAT of the train is also checked. It is probably compared with the ideal TAT that would be required for the distance that the trains travels.
2. Cleanliness :- The train's cleanliness is throughly checked. It is probably the most important factor that decides whether the train gets the certification or not! The toilets are under through scrutiny the coaches are also analaysed....
3. Train Staff :- Checking whether the staff is dedicated, sincere and hardworking.
It is only after a through all around inspection that the train gets a ISO Certificate.

May 01 2013 (21:23)
Blog Post# 739793-1     
Lawansh Singh*^   Added by: SGNR HS Inaugural 27 Feb^~  May 03 2013 (01:33)
I Can list two-
1.Shan-e-Punjab Express
2.Deccan Queen Express
For rest,waiting for replies... :)

May 01 2013 (21:28)
Blog Post# 739793-4     
12051 Janshatabdi Express~   Added by: SGNR HS Inaugural 27 Feb^~  May 03 2013 (01:34)
Konkankanya exp.
Mandovi exp.

May 01 2013 (22:04)
Blog Post# 739793-7     
Prateek   Added by: SGNR HS Inaugural 27 Feb^~  May 03 2013 (01:34)
1. shaan e bhopal - first train to get iso certification
2. kalka shatabdi
3. prayagraj express

Aug 01 2011 (17:44)
Blog Post# 213359-0     
Guest: 45b48db8   Added by: xxx  Aug 01 2011 (17:52)
This train is an ISO 9001:2008 certified train.

Sep 15 2010 (00:27)
Blog Post# 70348-8     
Vinay Kumar~   Added by: Ranjeet*^  Aug 01 2011 (21:30)
@guest: Re# 70348-7
ISO9001 is an internationally acclaimed Organization!!!
Its formed many Auditing organization Internationally, who under different modules & set up, categarize processes & system evaluation, before labelling or registering ISO Certification!!
U have to register (high fees) & they audit!!
doesnt guarantee end product, but the process!!
For trains:
1. Maintenance Time
2. Cleanliness
3. Staf & Disciplin followed through train run
4. Time Adherence
Feb 06 2016 (14:19)

Entry# 1921     
Signs & Symbols Used In Railway Tracks

★★★  Info Update
Feb 05 2016 (23:35)
Blog Post# 1730952-0     
Guest: 7fc2c6c1   Added by: xxx  Feb 06 2016 (14:19)
******** Signs & Symbols Used In Railway Tracks *******
1 Speed Limit Number on triangular yellow board : speed limit in km/h. 'KMPH' or 'KM/H' may optionally appear below the number. Black text.Sometimes the board has additional text, for instance 'RAJDHANI ONLY' may appear at the bottom, indicating that the speed is restricted for the Rajdhani service on this stretch.
2 Speed Limit - Rajdhani/Shatabdi Number on blue board: indicates a special speed limit (in km/h) for Rajdhani and Shatabdi trains. Text is in white. (But see above -- sometimes the
normal speed limit board is used with additional annotations for these trains.)
3 Termination Indicator T (painted on a yellow circular board) : Termination of speed limit
4 Termination Indicators T/P, T/G, or T/BOXN (painted on a yellow circular board) : Termination of speed zone for, respectively, passenger trains, goods trains, and goods trains with BOXN wagon rakes. In urban areas similar signs such as T/EMU, T/EMU-9, etc., may be seen (termination of speed limit for EMU rakes, EMU rakes with 9 coaches, respectively). Other termination indicators seen include T/PG (for both passenger and goods trains, seen on ECoR), T/P24 (for 24-coach or longer passenger trains), and T/L (for local, i.e., suburban trains, usually EMU or DMU trains). The Hyderabad area MMTS system uses a T/M sign for its trains. T/R is sometimes seen for railbuses. Occasionally, the sign T by itself is shown to indicate a termination of speed limit for all trains. A T/Raj sign was in use for Rajdhani trains when they were first introduced but is no longer used now. WR used T/Raj indicators for the 8-coach Bombay - New Delhi Rajdhani, and its EMUs used the same sign as a termination indicator.
5 Whistle Indicators 'W', or 'W/L' on a square yellow board. The 'W' is a general whistle indicator while the 'W/L' stands for Whistle for Level Crossing. The latter is also seen in Hindi with the characters 'see/pha' == 'seetee bajao - phatak'). Usually provided on approach to unmanned level crossings (and for manned level crossings without a clear view) about 250m away from the level crossing. Similarly, a 'W/B' sign is seen (less often) on approach to a bridge.
For more Indicators Please refer: click here
Feb 04 2016 (23:46)

Entry# 1920     
Dedicated BLOG on Semiconductors and other related componenrs used in the Semiconductors of 3-Phase Electric Locomotives in IR

★  Info Update
Feb 04 2016 (23:23)
Blog Post# 1729958-0     
Guest: 7fc2ccd5   Added by: xxx  Feb 04 2016 (23:46)
********* Dedicated BLOG on Semiconductors and other related components used in the Semiconductors of 3-Phase Electric Locomotives in IR *****
Ref: /faq/post/1875
In the above FAQ Post I describe all the details of GTO & IGBT Semiconductors and the difference between this Two.
In the above reply I describe the difference between a Thyristor(GTO i.e Gate Turn Off Thyristor) and Transistor(IGBT i.e Insulated Gated Bi-Polar Transistor)
Now in both of the above references one thing is Common that both GTO & IGBT are "SEMICONDUCTOR DEVICE" used in 3-Phase Locomotives. In perspective of this line it is now very Imperative to share the knowledge of "Semiconductor Device" in details here. So that all of you can know the Concept of "Semiconductor Device" in details.
Semiconductor Device:
Semiconductor devices are electronic components that exploit the electronic properties of semiconductor materials, principally silicon, germanium, and gallium arsenide, as well as organic semiconductors. Semiconductor devices have replaced thermionic devices (vacuum tubes) in most applications. They use electronic conduction in the solid state as opposed to the gaseous state or thermionic emission in a high vacuum.Semiconductor devices are manufactured both as single discrete devices and as integrated circuits (ICs), which consist of a number—from a few (as low as two) to billions—of devices manufactured and interconnected on a single semiconductor substrate, or wafer.Semiconductor materials are useful because their behavior can be easily manipulated by the addition of impurities, known as doping. Semiconductor conductivity can be controlled by introduction of an electric or magnetic field, by exposure to light or heat, or by mechanical deformation of a doped monocrystalline grid; thus, semiconductors can make excellent sensors. Current conduction in a semiconductor occurs via mobile or "free" electrons and holes, collectively known as charge carriers. Doping a semiconductor such as silicon with a small amount of impurity atoms, such as phosphorus or boron, greatly increases the number of free electrons or holes within the semiconductor. When a doped semiconductor contains excess holes it is called "p-type", and when it contains excess free electrons it is known as "n-type", where p (positive for holes) or n (negative for electrons) is the sign of the charge of the majority mobile charge carriers. The semiconductor material used in devices is doped under highly controlled conditions in a fabrication facility, or fab, to control precisely the location and concentration of p- and n-type dopants. The junctions which form where n-type and p-type semiconductors join together are called p–n junctions.
For more details and various Types of Semiconductor Device please refer: click here
What is p-nJunctions in c/w with Semiconductors?
Ans: A p–n junction is a boundary or interface between two types of semiconductor material, p-type and n-type, inside a single crystal of semiconductor. It is created by doping, for example by ion implantation, diffusion of dopants, or by epitaxy (growing a layer of crystal doped with one type of dopant on top of a layer of crystal doped with another type of dopant). If two separate pieces of material were used, this would introduce a grain boundary between the semiconductors that would severely inhibit its utility by scattering the electrons and holes.p–n junctions are elementary "building blocks" of most semiconductor electronic devices such as diodes, transistors, solar cells, LEDs, and integrated circuits; they are the active sites where the electronic action of the device takes place. For example, a common type of transistor, the bipolar junction transistor, consists of two p–n junctions in series, in the form n–p–n or p–n–p.The discovery of the p–n junction is usually attributed to American physicist Russell Ohl of Bell Laboratories.However, Vadim Lashkaryov reported discovery of p-n-junctions in Cu_2O and silver sulphide photocells and selenium rectifiers in 1941.A Schottky junction is a special case of a p–n junction, where metal serves the role of the p-type semiconductor.
For more details on p-njunction please refer: click here
What is p-type and n-type semiconductor material ?(Also known as Extrinsic Semiconductor)
Ans: click here
What is "Doping Agent/Dopant" used in Extrinsic Semiconductor ?
Ans: click here
Attached Images:
An n–p–n bipolar junction transistor structure
Link: click here
Link: click here
Link: click here
(Hope from this BLOG all of you get a Complete Idea about Semiconductors used in 3-Phase Loco[i.e WAP-5/WAP-7 & WAG-9] of Indian Railways)
Feb 01 2016 (20:24)

Entry# 1919     
Boxer Bhai~
retiring room

General Travel
Feb 01 2016 (19:45)
Blog Post# 1726843-0     
NAGA RAJU   Added by: Boxer Bhai~  Feb 01 2016 (20:24)
i had booked a retiring room with my ticket , if cancel my ticket , automatically canceled that retiring room ? ####### urgent ###
Feb 01 2016 (19:22)
Fares/Concessions/Refund Rules

Entry# 1918     
छोटा आदमी~
Non standard circular journey

★★★  General Travel
Nov 19 2015 (11:37)
Blog Post# 1654263-0     
छोटा आदमी~   Added by: छोटा आदमी~  Feb 01 2016 (19:22)
***** Request Letter // Format for booking non-standard Circular journey tickets. *****
attached here is letter required for booking circular journey tickets, a passenger is suppose to present a letter in this format to the concerned booking office . A "circular tour travel authority" ticket is issued mentioning all details on it (i.e - passenger details, complete travel itenerary, class etc)
After this,
one needs to fill in separate reservation forms for all legs of this circular journey and present this "circular tour travel authority" ticket to the booking clerk, only reservation charges are levied on all individual legs of journey tickets.
Important Info - the fare for non-standard circular journey it calculated slightly different from telescopic fares.
Non standard Circular Journey Ticket is charged for as two single journeys, the length of each single journey being taken as half of the total distance.
i.e total distance for my circular journey is 6000 kms, then fare will calculated as 2 single journeys of 3000kms (half the total distance)
Jan 31 2016 (22:16)

Entry# 1917     

★★  Rail Fanning
Jan 31 2016 (17:26)
Blog Post# 1725808-0     
Guest: 7fc2c321   Added by: xxx  Jan 31 2016 (22:16)
******** Indian locomotive class WP was a class of 4-6-2 "Pacific" steam locomotives used in India *****
The Indian locomotive class WP was a class of 4-6-2 "Pacific" steam locomotives used in India. It was introduced after World War II for passenger duties, marking the change from 'X' to
'W' as the classification code for broad gauge locomotives.The class was designed specifically for low-calorie, high-ash Indian coal, by Railway Board designers in India.WP class locomotives were capable of doing up to 110 km/h (68 mph) and were easily recognized by their cone-shaped bulging nose, usually with a silver star device painted on it.
For more details: Indian locomotive class WP
Attached Images:
Locomotive class WP by Fablok in 1959
Link: click here
WP/P class 7200 by Baldwin from 1947, at the National Rail Museum, New Delhi (1993)
Link: click here
(Please note that the Coal Carrier is attached with the LOCOMOTIVE. A Robust Locomotive in all respect)
Jan 31 2016 (15:16)
Coach Construction/Seating Arrangements

Entry# 1916     
Abhishek Jaiswal
What is Doctor Coach

★  Travel Question
Jan 31 2016 (13:52)
Blog Post# 1725687-0     
Abhishek Jaiswal   Added by: Abhishek Jaiswal  Jan 31 2016 (15:16)
What this "+" sign denotes at coaches?
Page#    1453 FAQs  <<prev  next>>

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