rides the back of the Santa Train

Hello everyone,

He's the guy in the red suit who rides the back of the Santa Train from Shelbina, Kentucky, across the hills of southwestern Virginia, 110 miles through poor villages and old hill towns to Kingsport, Tennessee. The train leaves promptly at 730, and he has to pick up the pace to get there.

who rides the back of the Santa Train: Should there be a preposition before the back of ?

Or

What is who rides the back of the Santa Train ?

Many thanks in advance.
 
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