This is the reply I received from TRAINZ. I guess I should've paid more attention to the description before I purchased it. Lesson learned.
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Hello Daniel,
Per our parts department it was for one truck only, they are priced at $25 each.
Their "parts department" is clueless. I've advised them of errors in their listing, only to have them tell me their "parts department" said they were correct, when I know ****ed well they weren't.
Check the original listing and see if it said pair, since that's the way Atlas sells them. If not, you may be hit with a 15% restocking fee (or you may not), but whatever the case, you should return them, as long as it's within 30 days of when you got them. $25 for a single used Atlas truck is highway robbery...