Ah, Wimbledon South sidings as was. The longest, No 1, next to the Down Slow could accommodate 4 x 8 car sets (on the juice - it did extend further, under Durnsford Road bridge for access to a private siding at one time) and No 2, 2 x 8 cars. These were vaguely looked in to re-commissioning for the 10 car railway of more recent times, but were dismissed. I can't say why for sure, although having that amount of stock out of reach from the depot across the way and prone to vandalism may have come in to it. There has also been an access problem for xx years now, as the long ladder crossing allowing a move from the depot/LUL lines right across to platform 8 at Wimbledon station was cut back, so no access to platform 8 and hence loss of access to South siding No 1 directly from the depot. Stock stabled in such locations over night would ideally have been to the depot first for internal cleaning etc etc. I think No 2 was only accessible from platforms 9 & 10 back then, but am speaking from memory.