The F-3's and earlier Geeps. There are a lot of loco's that can run on O-31 so long as the truck wheelbase and overall length are short. There is a speeder (maintenance vehicle) that is Legacy equipped that would probably be classified as the smallest Legacy motorized unit. Its not meant to pull anything but it is command controlled.
Generally we've found that engines rated for O36 will run on O31. (Inner loop on the store layout is O31) It appears that Lionel uses O36 as their minimum to encourage the sale of Fastrak.
The Lionmaster series (have all the command features and most of the details of a scale engine, but are shrunk down slightly for smaller curves) all run on O-31. The smaller scale engines will too as mentioned already.
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