Different risk profile. Trains generally don't have belts, crumple zones, padded surfaces, etc. Their risk profile dictates they avoid accidents. Cars are more

Different risk profile. Trains generally don't have belts, crumple zones, padded surfaces, etc. Their risk profile dictates they avoid accidents. Cars are more chaotic, even in automated form. They are designed to crash safely as possible first, then anti-crash measures are added. Because trains depend soley on the anti crash measures, they must be stricter. The issue of harming dozens rather than a few humans also factors. Its an uneviable position for those responsible imho. Every move is going to be a little wrong and costly on some level.