yesterday i was tracking wap7 on ntes and the loco with icf rake load of 24 coaches took just 2 minutes to accelerate from 20 to 110 ,,, I have experienced this in reality as well ...
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when they reach top speed then wap7 /wap4 / wam4 are equal but main thing is the time taken to reach that top speed also known as acceleration , a loco which takes 2 minute to reach top speed from start and a loco which takes 6 minutes to reach top speed from start...
more... can never be same .
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If given two options to a racer
- a car with acceleration of 3.5 sec and top speed 200kmph
- a car with acceleration of 7 sec and top speed 220 kmph
then racer will surely buy car of acc 3.5 sec .