(do XC actually serve Crewe? All Manchesters avoided it I thought).
I was just wondering how many stations have more than 3 TOCs serving it - and then I thought I'd let RailUK have a go at it :P
I'll get the ball rolling:
London Euston
Birmngham New Street
I failed by not noticing the OP put New Street up already. But also, considering the OP asked for more than 3 TOCs, we seem to be getting a lot that are only served by 3.
Sunderland:- T&W Metro - Northern - Grand Central
I know T&WM is not a TOC but as they use the same rails!