Looks similar to the 36v utility carts I used to use. Similar carts are used at airports for towing luggage carts, etc. If memory serves, they were made by taylor-dunn and would go about 15 MPH, mostly because of the high gearing (13:1 or so) and tiny 8" tires. They had contactor controls for low, medium and high speed (speed being relative, of course 8-)
The 36v motor should have no problem at 48v, and might work at 72v but probably nothing higher. Should make for some fun experiment material. Congratulations on the find!
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