I'm not aware of a drop in replacement as you are requesting. You may be able to adopt a power truck from something like a 6-24535 or 6-34631 but it would be cheaper to rebuild/refresh the horizontal motor.
If you're running all day at a museum, best bet would certainly be a Williams chassis with the Lionel cab attached. The Wms Texas Special was painted in a flat red and is very disappointing (lackluster) compared to the originals or the handsome RK Scale F3 set that MTH did.
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