They are the rooftop types with the frame, electronics and battery box, although I may try to get one of the voltage converters so they can be run off the transformer auxillary power output when I get round to building the layout 
I did see those desktop units, they are pretty cool, although you'd really need the 0 gauge signs rather than the HO gauge ones to make it worth while

I did see those desktop units, they are pretty cool, although you'd really need the 0 gauge signs rather than the HO gauge ones to make it worth while

Happily collecting things all my life...
