That's a different, orthogonal issue. Look it up there's a bunch of tedious FRA rules about crash-worthiness which Europe doesn't have. It makes the trains which can legally run needlessly expensive and they wear out the tracks faster. The rules don't apply to metros and subways, but if the tracks have any switch anywhere connecting to the national network then FRA rules apply to the whole system. The result is that planners can't extend their metro via shared freight corridors. There are plenty of regulations already, and in some cases they are clearly counterproductive. Proposing to solve things by putting more regs on the pile is a dubious proposition.