(01 Mar 2015, 12:45 pm)DaveyBowyer wrote I don't think it would be cascades. If GNE wanted to continue with shortfalls, they could use 6001-6007 and 6049-6055 but, the next natural progression role for them would be to upgrade the Pronto and provide reliable spares to existing B9 services and if all goes well with the flybrid wheels on the CC and Fab 56, make up the PVR on the Angel.
You're desperate to get rid of the B9s on the X1 aren't you!