You are looking at a PART for your classic Lionel Standard Gauge rolling stock.
This is a Series 10 single rivet truck. Note that they come with screws and spacer for mounting. Also note that there are two dimples on each side of the mounting hole--not sure what they were used for (if at all).
CONDITION: C-7/8/ Not sure if these are original or repro. They look original to me, and came to us ina collection of original items.