nobody
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I find it annoying that in movies and on TV, when a train hits a car or something, it usually just keeps going. I assume that's not what would happen in real life.
It happens. I think for a small car to derail a train it has to be the right circumstances, like on a curve or if part of the car somehow rolls under the train. A similar question answered by a train engineer shows some stuff that he's hit or run over on a train:
How much of an obstruction does it take to derail a train?
Quite a bit of an obstruction, I have ran over trees, animals, and vehicles on the track without derailing the train. Most of the derailments I have been involved in were caused by ice and snow, track defects like broken rails, switch points not properly fitting against the stock rail, cross level track, and the others were caused by wheel defects, or other equipment failure.
Trains being so heavy, with so much momentum when rolling down the track tend to push any obstruction out of the way instead of derailing.
Another rail person stated this:
Can a car or truck derail a train?
The simple answer is yes and the complicated answer is yes if… If the vehicle is in a particular place and gets hit by the train, such as a curve or gradient, the front bogies (the axles are attached to bogies) will lift up and leave the rail momentum will do the rest. Even if the initial impact pushes the vehicle under the train it will roll once again causing the bogies lift. Only if the train hits a vehicle and pushes it out of its path or splits it will it not derail, but once it goes under then odds are it will derail. Even a herd of animals going under can cause a train to derail.
Finally another rail employee from the UK said:
Can a car or truck derail a train?
Short answer is yes. . A few years ago, a HST(high speed train) hit a car left deliberately on a Automatic half barrier crossing, on the Great western main line. The Train driver died and there were injuries to passengers. Another time, one of my company colleagues got involved with another train hitting a car that had gone off the road because the car driver fell asleep. The passenger train ploughed into it, and the freight train hit the wreckage, killing the driver.
It's silly that movies and tv shows never show a train damaged or derailed by a train, but I'm guessing it's because of expenses, story, and trying to get it into people's heads not to stop on tracks like morons.