There are many other problems. A subway or city train stops every few minutes. This means that if somebody gets hurt, has a stroke, assaults somebody, starts s

There are many other problems. A subway or city train stops every few minutes. This means that if somebody gets hurt, has a stroke, assaults somebody, starts shooting up… there is almost immediately a way to board more staff and handle the situation. On a train with hours and tens or hundreds of kilometers between stops this is much less the case.