It probably wouldn't kill you outright like a fast moving train would (as you say, it's all about force) but it might cut off your legs and you'd bleed to death. Ouchy!
There are better ways to go. With the grill some engines have to push away cows it isn't certain you'd really go splat, just break every bone and survive. Why not postpone the decision and see what tomorrow brings? Things can't be as bad as you think they are and likely will get better.
I say you'll die but I want you to go and check, cause I'm not sure~ :)
Jump infront of a train and see what happens