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Blog Entry# 3105300
Posted: Feb 14 2018 (19:00)

10 Responses
Last Response: Feb 17 2018 (12:40)
General Travel
Feb 14 2018 (19:00)   12023/Howrah - Patna Jan Shatabdi Express | OYR/Waria

12301 Howrah Rajdhani Express~   2033 blog posts   35 correct pred (70% accurate)
Entry# 3105300            Tags   Past Edits
Today's incident:
Janshatabdi left Durgapur at 1700 hrs and in a mood to cover the 60 mins delay it speeded rapidly to MPS. And as usual it was crossing OYR in MPS. Just then there was a rapid sound of something breaking and emergency brakes were applied and the train stopped with a jerk. 115kmph-0kmph in 15 seconds
LP got down and checked the wheels of the train
then train is running at 60-70kmph. And LP is checking wheels at each station.
Can anyone explain what must have happened ??

5 posts - Wed Feb 14, 2018

Feb 14 2018 (21:46)
12301 Howrah Rajdhani Express~   2033 blog posts   35 correct pred (70% accurate)
Re# 3105300-6            Tags   Past Edits
Fire in brakes?

Feb 14 2018 (22:16)
Guest: 6cd85cfd   show all posts
Re# 3105300-7            Tags   Past Edits
HM ..IT can be a possible reason ..detailed info will be provided tomorrow

Feb 15 2018 (15:48)
Obi Wan has taught you well~   3768 blog posts   1666 correct pred (74% accurate)
Re# 3105300-8            Tags   Past Edits
1 compliments
Useful and thanks
Alternator pulley got jammed
as it is ICF self generated rake, the electricity required for consumption on board coach is done by having a v-belt go over the axle of the coaches, which then helps drive the generator to generate electricity. The alternator pulley, which is the other side on which V-belt is wound, got jammed and the axle tried to pull the belt over stationary pulley, leading to heating and eventually emission of smoke.
source: elocos

Feb 15 2018 (20:32)
12301 Howrah Rajdhani Express~   2033 blog posts   35 correct pred (70% accurate)
Re# 3105300-9            Tags   Past Edits
But why less speeds i.e., 60-70 kmph and checking of wheels at each stn

Feb 17 2018 (12:40)
Obi Wan has taught you well~   3768 blog posts   1666 correct pred (74% accurate)
Re# 3105300-10            Tags   Past Edits
1 compliments
Well explained
The complete report goes something like this:
(PNBE-HWH), Detained at MKA(Mokama) station for smoke emission from Coach no. 02153/CZAC/ECR due to PP side Alternator pully jammed. ACCI cut all V belts and load transfer to NPP side and worked normal. Time- 06.57-07.29(32-2=30" extra). Primary-RNCC/ECR.
It seems that the ACCI (AC coach in charge) didn't have the requisite tools to cut the V-belt with him, as things like these aren't very common. so they had to wait until a major station came up where they would find the necessary tools for the operations.
until then, the train had to be hauled without compromising safety of the coaches and the passengers inside.
an ac coach has something called as RMPU or roof mounted package unit, which do the work of providing conditioned air inside coaches (AKA air conditioners). these are rated at 25 kw each, and there are two per coach. these are powered by the alternators i mentioned, and in the absence of alternator's pulley rotating, whatever power that ideally should be generated by the motion of the V belt was now instead getting dissipated as heat on the stationary pulley. this energy is quite high, and hence the LP had to keep on inspecting the under carriage to see if any flames have erupted at the concerned spot. the train could be driven very slowly to avoid the problem, but apart from blocking the section it would have also lead to discharging of batteries provided underneath the coach. these batteries supply power when train is stationary or too slow, as in that case alternator can't generate enough power on its own. too slow and the batteries would get discharged by a huge amount, too fast and the coach would have probably caught fire owing to immensely high heat generated, so he took the middle path and drove at around 60 :P
I don't exactly remember the speed, but i believe that below 40 Kmph, alternators don't supply power for AC, rather its the battery which does the job, so he was driving above that speed.

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