Here is a Lionel-compatible three rail O gauge Great Northern boxcar. This one was put out by Industrial Rail for your three rail O gauge layout. It couples up to Lionel, MTH, Williams, etc.
You gotta love the iconic GN logo.
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Knuckle couplers
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DIe cast sprung trucks
CONDITION: C-8. Car looks like new. BOX shows considerable wear especially on edges and ends. Nice print.