Do you know how traction motor is fitted inside a bogie and on axle...trqction motor does not fall completely on the track...only the bracaket holding tge trqction motor nose broke and fall on the track, still the other end is attached to the axle...beind weight of approx 2 ton, it derails the bogie on which it is connected, causes sudden application of emergency brakes...as the logie bogie is already derailed, irregular forces can cause derailment.....watch video of news station with sudhansu mani sir.