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Blog Entry# 1756698
Posted: Mar 03 2016 (21:10)

22 Responses
Last Response: Apr 02 2016 (19:22)
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Mar 03 2016 (21:10)   NDLS/New Delhi (16 PFs) | RPM/WAP-7/30421
 
guest   6387 blog posts
Entry# 1756698            Tags   Past Edits
#railwayengineering
*************** Procedure of Lifting of Axle of Three Phase Electric Locomotives(WAP-7 & WAG-9) in E-Loco Website *******
Pictorial (Movies) - courtesy of ELS/LGD/SCR
For Movies Please Refer this Link:
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more...
click here
(Screenshot Attached with this BLOG)
For the PDF Document regarding Lifting Instruction by RDSO please refer this Link:click here
(PDF Document Attached with this BLOG)
Attached Screenshots:
Lifting Link of 3-Phase Loco in E-Loco Website
Pictorial Movies Link
Attached PDF Document:
Wheel Lifting Instruction of 3-Phase Loco Published by RDSO (18 Page PDF Document)
Attached Image:
WAP7-RPM-30421 --- Up close & personal with this 3-phase beauty by Sam at Coimbatore on 18th Oct 2015, while this speedstar was taking a nap on the loop line under mid-day sun
Link: click here
Courtesy: Sam

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Apr 02 2016 (12:53)
indian railways   7174 blog posts
Re# 1756698-22              
A few points to note :-
1. Those numbers are actually, simulation results. In real life, N number of other variables get added up as well.
2. It was officially replied by IR that WAP7 locos can be relatively more effective up to 130 km/h only, w.r.t. WAP5.
3. No matter what the TE is, the loco has to haul its own dead
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weight first, then the rake :). A big, heavy locomotive weighing around 123 tonnes with 12 wheels and longer wheel base faces significantly greater rolling resistance when compared to a lighter, 78-ton loco with only 8 wheels.
That's why, in railway terminology, there's another term called "drawbar pull". It's the effective force applied by a given loco at the coupling of the rake or drawbar. The drawbar pull is very similar for both up to 130-140 km/h.
4. In the pic shared by Pratik sir, there's no mentioning of the horsepower of the locos. I'm assuming that the HP considered were continuous HP and not maximum for both of them. Only for P5, you can see another column mentioning the 'increased' HP (4.5 MW) which is the max HP of course.
5. For WAP5, TE values up to 160 km/h are mentioned and, for WAP7, 140 km/h only.

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Apr 02 2016 (12:56)
indian railways   7174 blog posts
Re# 1756698-23              
Don't worry. In next 3 years, all sheds will be equipped to handle all types of 3-phase locos, according to the latest circular of the railway board. They'll take P5 later. :D
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Apr 02 2016 (13:10)
Ben_Kenobi~
Ben_Kenobi~   4222 blog posts
Re# 1756698-24               Past Edits
in current scenario speeds>130 Kmph don't make much sense and so i considered only till 130 Kmph.
i knew of short time ratings, but you can drive your loco at those loads for few minutes only. also the heat generated has to be dissipated, and considering that seasons in many parts of south of India are hot, hotter and hottest ( :P ) there may be a derating factor involved.
as a passenger loco P5 is obviously superior for high speed ambitions of IR, but currently i'm not sure that is the case.
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Apr 02 2016 (14:13)
Pratik~
Pratik~   5604 blog posts
Re# 1756698-25              
tab tak spanish rakes aur imported rakes bhi aa jayenge which wont need waps :p
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Apr 02 2016 (19:22)
TheMadrasMail~
TheMadrasMail~   6349 blog posts
Re# 1756698-26              
Even with SCR, the reason for rejecting was more about convenience. LGD already has a sizeable fleet of WAG9 locos. And, other than the gear ratio and software changes, WAP7 is nothing but a white WAG9 :P . So, adding WAP7's would not cost them anything as there is no infrastructure change needed. Whereas adding WAP5's needs quite a lot of infrastructure changes. I hope sheds which are still not in the 3 phaser list, like BZA and AJJ get to home WAP5's.
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