Scotrail Class 156 Uncoupling from Class 153 

The 153 only now used by ScotRail and transport Wales who are converting 4 of them as bike units like the Scottish ones for use on the central Wales line

ScotRail honestly could perhaps do with more 1 single class 153 units depending on the bike trains and how many passengers use them. 156s have been with the operator since birth. Very comfortable trains.

Video starts at 2:10

2:04

The 153 is diss’’ from the 156!

I've got pics of the splitting of a 153/156 at Lowestoft while still at GA

This is why trian had because it small