I've been able to acquire a few MTH Premier motive power offerings over the years. Patience is definitely a virtue as there haven't been all that many! Here are a few pics...
MTH GP35's-powered & non-powered. Unfortunately MTH got the gray color wrong on these (it's way too light), but I bought them anyway because there just hasn't been much available! On a side note, AtlasO got the Guilford gray color correct on the diesel offerings they did many years ago.
MTH GP40...
A bit more "southern" New England, MTH Providence & Worcester GP38-2's (both powered)...