(03 Jan 2026, 3:49 pm)Iamtheone8483748 wrote My guess is 13 for washington for the X1 (12+ 1 spare), then 12 for riverside for the X10 and X21, with 6377 as the spare.
Good thing with this is that the X10 can be prioritised if 6377 unavailable, with a suitable B9TL stepping in on the X21.
Hopefully Riverside get a further order for the 10/10A/10B/12 with a few extra spares thrown in too, and that should be Riverside nailed on.