Agar LHB train ki speed 130 Hai to wap4 do ya wap7 do koi fark nahi padta... For speed more than 130 ( Gatimaan and Bhopal shatabdi ) Wap5 is given
You think wap4 is less capable ? I may remind you that many Rajdhani also got WAP4 recently. And maintained average speeds of 85--90