Today I would like to suggest the Old Dalby Test Track and some experimental types that may prove difficult to place elsewhere but should still be included in the lineup. Some of the experimental types could include... APT-E APT-E cab Prototype HST (Class 252) Prototype HST cab
Class 140 Prototype Pacer Class 151 Prototype Sprinter Class 151 cab Class 210 3 and 4 car DEMU Prototypes Class 455 cab with some similarities to Class 210
This actually sounds like a really interesting idea, the idea of experimental trains is a very unique concept.
Although never actually used on the line, perhaps the Class 41 (D600) Warship might also work on this route unless a vintage Western Region route were to be made. The cab of these locomotives should be largely similar to the Class 22 Baby Warship except for duplicate switches/controls/gauges as these were twin engined variations of that class and had the A1A-A1A wheel arrangement in place of the Class 22s B-B setup.