For those joining the train at London Waterloo it's booked to arrive on platform 19. Bromley South should be platform 2 outward and 3 on return, Deal will be platform 1. For anyone wanting to see the ECS movements here are the timings.
5Z84 09+39 Southall WCRC - London Waterloo (34067 arrives on REAR)
Southall WCRC d09:39
Southall Yard a09:49 d09:57
Southall East Junction pass 09/58
Hanwell Bridge Loop a09:59 d10:05
West Ealing pass 10/08
Acton West pass 10/13
Acton Main Line pass 10/16
Acton Wells Junction pass 10/20
Willesden South West Sidings pass 10/23
Mitre Bridge Junction pass 10/27
North Pole Junction pass 10/28
Kensington Olympia a10:31 d10:36 (platform 3)
Latchmere Junction pass 10/42
West London Junction pass 10/44
Nine Elms Junction pass 10/47
London Waterloo a10:53 (platform 19)
(then forms 1Z84 11:03 London Waterloo - Deal)
5Z85 17+20 Kensington Olympia - Southall WCRC (34067 departs on FRONT)
(formed from 1Z85 14:00 Deal - Kensington Olympia)
Kensington Olympia d17:20 (platform 2)
North Pole Junction pass 17/25
Mitre Bridge Junction pass 17/26
Willesden South West Sidings a17:28 d19:53
Acton Wells Junction pass 19/56
Acton Main Line pass 19/58
Acton West pass 20/00
Hanwell pass 20/02
Hanwell Bridge Loop a20:06 d20:11
Southall East Junction pass 20/13
Southall Yard a20:14 d20:25
Southall WCRC a20:35