Can anyone tell me keeping original performance and other data's on side.does hauling trains like 12570 GBR or rajdhani (19 coacher) running with WAP4 ir WAP7 make any diffrence on indian tracks which loco is more fault prone ?? Can i say on any day ki aaj isko wap4 mila hai to ye late hogi hee ya wap7 mila hai to time pe pahochegi.yaa aisa koi fark ni padta wap4 ya wap 7 ka ?