Class 455s on the Mole Valley Line between Dorking and Horsham.

[Bikeman78]

There was also a special procedure for manual SDO on 455s (where you had to lock out the rear 2 coaches on an 8 coach formation) between Dorking and Horsham which also required conductors to intervene. I believe I was actually involved in running the last such train, if my memory serves me correctly. There were no booked 8 coach services towards the end of 455 traction on the line, but it happened occasionally in emergencies.

So far as I know, the booked eight car workings ceased when the 377/6 arrived and the 456s went to SWT. Since then there were just four single unit workings to Horsham which reduced to three in December 2017.