Re diesels, the Lionel F-3, FM Train Master, GP-7/9, and the NW-2 were all close to scale size and introduced from the late 40's through mid 50's. I know for sure that the FM Train Master was converted to both 2 rail and outside 3rd by scale modelers in the 50's, possibly some of the other diesels as well. If you are talking about more detailed engines, the Weaver RS-3 may have been 1st. It was more detailed then the early MTH production diesels.
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