Trains have disadvantages to stopping. ( also getting up to speed )
1: they have low friction contact with the " road " surface, in this case metal wheels against metal track, a slight + is they have many wheels to brake on.
2: Trains are often heavy, so stopping a large weight at a given speed take more effort or distance than stopping a smaller weight at the same speed.
A 1.5 ton car going 80 kmh VS a 40 ton semi at the same speed, the truck will need much more distance to come to a stop.
I have seen videos, for instance with a intersection a few car lengths from a railroad track, so if people / trucks are stopped by red light, and a train are coming, you are in trouble.
Another issue i have seen a few times are break downs on a train track, again if you are not rational / have no help to push the car, you are screwed and all you can do is evacuate your vehicle ASAP.
There are also some American town, with a train line strait down the middle of main street,,,,,,, that was probably okay in the wild west days, it is pretty much insane its still that way.
My silly mind tell me that MAGLEV trains might be able to brake faster as you should be able to reverse the magnets and use them to stop, we have all tried to push 2 similar magnet poles together.
And don't get me started on all the boat in marina crashes where the new boat owner forget there are no brakes on a boat only reverse gear, here you will often see people doing massive damage with their boat, in some cases end up on top of another boat as a boats pointy front tend to want to climb obstacles.
Boats though they have a pretty high resistance in water, well a huge panamax ship if you just put it in neutral even with a massive propeller acting as a brake of sorts, well the stopping distance are still nautical miles then. the turn radius at speed are also horrific, so don't put your little dingy in front of a big ship, cuz it can not stop fast and it can not turn fast.
Big ships stopped can often turn on a dime using their thrusters, but at speed they are completely useless.
In the mid 80ties visiting the French national railroads, and seeing video on their fast trains, some times ( in testing at least ) the wheels wouldn't even touch the track,,,,, so back to the drawing board CUZ that's no good at 280 kmh which they drove back then as i recall.