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What is a DEMU  
1 Answers
Oct 18 2019 (19:04)
General

Entry# 2215     
_V_K_^~
What is a DEMU

Info Update
23437 views
Oct 18 2019 (19:02)
Blog Post# 4462260-0     
Guest: 6cd3d7ac   Added by: _V_K_^~  Oct 18 2019 (19:04)
Briefly about DEMU:
*DEMU is a self-propelled electric vehicle/coach used for urban transport.
*The lighter Coaches faster speeds and higher load carrying capability have made DEMUs very economic and passenger popular.
*It is economical for short rake information (3-car/ 6-car, 9 –car rake).
*It
...
more...
is also advantageous for running train in either direction without changing the loco position.
*This is almost similar to EMU. In EMU the source of power is overhead electricity, whereas in case of DEMU the source of power is the diesel engine.
*In 1994- 1995 they are first introduced in Indian Railways.
The benefits obtained from DEMUs are:
 Fast and frequent service
 No need for reversal at the terminals as it can be driven from either end
 High acceleration
 Ergonomically designed coaches
 Low capital and maintenance cost
 Efficient use of rolling stock
In Indian Railways DEMUs are available both of 700 HP and 1400 HP. In addition, 9 units of DHMUs (Diesel Hydraulic Multiple Units) are also operating in SC Railways.
☆Operating Parameters of 700 HP DEMU:
•Track Gauge : 1676 mm (broad)
•Composition of unit : 1 DPC – 1 TC + 1 DTC
(DPC: Driving Power Car, TC : Trailer Car, DTC: Driving Trailer Car)
•Passenger Capacity : DPC – 79, TC/DTC – 108
•Estimated Service weight : 188 Tones
•Maximum Axle Load : 17 T (DPC), 15 T (TC/DTC)
•Wheel Arrangement : BO-Bo
•Wheel dia : 952(New), 877 mm (Fully worn), 914.5 mm (Half worn)
•Effective traction power output : 610 HP
•Transmission : Electric AC/DC
•Max operating speed : 100 KMPH
•Clearance above rail level : Minimum of 102 mm with Coaches fully Loaded and wheels fully worn
Source: PDF from Goggle.
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