bilevel trains

[leedspete]

is there a reason why we dont have these is this country.i went on one in france and it was interesting
loads of room and they were clean----ish
is it because of the tracks we have in the uk
i thought they would be ideal for more people using trains

 

[DaveNewcastle]

This question comes up very often on here.
The concept could improve capacity but with the risk of increased station dwell times. The bigger constraints are gauge and possibly platform height.

The most recent 2 threads on the matter were here and here. I hope you find those debates interesting.