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Blog Entry# 2067908
Posted: Nov 22 2016 (15:42)
47 Responses
Last Response: Nov 24 2016 (02:49)
47 Responses
Last Response: Nov 24 2016 (02:49)
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read more... 80% of railway coaches unsafe - Mumbai Mirror
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More rigorous maintenance is required for hybrid LHB and double decker coaches which have pneumatic suspension at secondary stage :P. Pure LHB coaches require less maintenance because they have nested coil suspension, both at primary and secondary stages.
Ride index is 3.25 for ICF EOG (Rajdhani/Shatabdi) coaches and the value increases with increase in speed. Our normal ICF SG coaches may attain higher values at lower speeds, like 3.25-3.5 at 120 km/h itself, due to the usage of stiffer springs.
I.Rlys has plans to retrofit the existing ICF coaches with CBC coupling...
more...
Ride index is 3.25 for ICF EOG (Rajdhani/Shatabdi) coaches and the value increases with increase in speed. Our normal ICF SG coaches may attain higher values at lower speeds, like 3.25-3.5 at 120 km/h itself, due to the usage of stiffer springs.
I.Rlys has plans to retrofit the existing ICF coaches with CBC coupling...
more...
Actually, locomotive factor is hardly taken into consideration as far as jerks are concerned. Even WAP4/WAM4 can produce strong jerks. I almost spilled my coffee while travelling by TN Exp which was powered by an Erode based WAP4 :P.
The amount of jerk felt depends on :-
1. The coach you're in : Old couplers are designed with a considerable 'slack' between the mating parts. This slack gets added up over the length of the train. If you're travelling in the 24th coach of the train you may feel considerably stronger jerks...
more...
The amount of jerk felt depends on :-
1. The coach you're in : Old couplers are designed with a considerable 'slack' between the mating parts. This slack gets added up over the length of the train. If you're travelling in the 24th coach of the train you may feel considerably stronger jerks...
more...
For ICF EMU (old) coaches, the ride index is around 4 at 80-90 km/h, not exactly 4. For short distances, this value is tolerable.
For metro coaches (imported ones, not the ones owned by I.Rlys), the ride index is found to be around 1.25 at 80 km/h :D
For metro coaches (imported ones, not the ones owned by I.Rlys), the ride index is found to be around 1.25 at 80 km/h :D
Not the intensity of the jerks, but the locomotive does have an effect on the coupler strain. Particularly in CBC coaches, the knuckle and the CBC lock are usually the most frequent points of failure. With the starting acceleration ( or rather, the high draw-bar forces at start) of the WAP7, any material defects in the coupler, can lead to an increased chance of the coupler breaking. In fact, during the 2005-2007 period, there were man cases of train parting due to CBC coupler failure. These were mainly due to material defects, but the problem was being worsened by the locomotives as well. While the failure rate has become very low now ( as is usually a problem only with freights), nonetheless, some internal buffer modifications had to be done to allow for higher drawbar forces.