hexagon789
Veteran Member
Theoretically, any loco with a buckeye can haul MK4's.
Afaik the TOE has a drophead buckeye, as 47s hauled them in BR days into Bradford iirc, and 47s don't have buckeyes.
Really all you need is an air-braked loco for conventional haulage, but I'm sure any prospective operator will want to use them in a push-pull configuration.