The GG-1 is just an EP-3 with a fancy body and the insides rearranged to cook the crew. So I'd go with:
1. EP-3 'Flat Bottom' in dark green with the gold stripes and lettering.
2. EP-5 'Jet' in the pre-McGinnis pin-stripe scheme.
3. EL-C/EF-4 in VGN or NH paint schemes.
4. Class 373 'Eurostar' power car/loco
5. "Little Joe" EF-4