DIYbanter - View Single Post - wheelshape to run on top of a circular rail?

wrote:

a pair of circular pipes exists, running in parallel.

I wish to use them as tracks for a small railcar.

where to buy wheels, whose "tread" surface is a semi-circle of the
right size to fit over the pipes? very low speeds in this cargo
application, friction-caused efficiencies should not be an issue.

Or must they be made up by a shop on a custom order?

Got a fun park with a roller coaster ride near you? You might ask where
they get their wheels from.

Or try asking at a casters store (yellow pages, "casters".

Cheers
Trevor Jones