I think when he go down track, he electrocuted by the 3rd rail
liao, then body fall to the tracks, train e-brake(got distance when
braking mah) the rain run over the body, then got heavy cuts and
squashed lungs, heart, etc. cuz of that, died
The return current on the running rails can be safely considered
as non-lethal, however if the rails are broken there may be a
current present.