Constructing a Tatra T5C5

[Sumpter250]

This would be Budapest and they use 1435mm gauge, so using straight 16,5mm H0 would be prototypical. (might be easiest to get bogies and engines for, too...)

I won't argue with the ease of finding motorizing parts, in HO scale standard gauge.
The pantographs, if you string the overhead wire, would have to be harder than the plastic, just for the wear that they will endure. Definitely conductive if the intent is to power from the overhead wire.

They'd look really good on a point-to-point operation.