pennsy did have 0-6-0 switchers so maybe that engine and i agree with Jim1945 the gp7/9 could also work as pennsy did have them also someone made a F7 a and b just throwing engines out there you can look up the pennsy steam and diesel roster and if in irl they used it you could make it up to you of course
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The C25 is similar to the PRR H3 too !