Frank Incense wrote:
I think its based on "where" the train is in relation to your station.

if it gets held up when its 2 min away then it will still take 2 min
to reach you once it actually departs after being delayed.

see - easy as quantum physics (or trying to spell it even)

That's what I thought. I understood that it was all transponder based these
days. Train reports position to computer, computer calculates time to
subsequent stations and updates platform displays. I've certainly never
noticed any "standard" LT minute, I've even seen displays adjust from '1
min' to '2 mins' whilst I've been waiting.