This is a picture of an HOn30 Boxcab diesel. The project was made using
a Grandt Line HOn3 boxcab, with the wheels slid in a bit to get HOn30 gauge.
This is done by carefully trimming some of the "shoulder" off
either side of the gear on the axles. The end beams and steps were modified
a bit to accommodate an N scale coupler. Grandt has a similar small GE engine
that could be converted as well. The disk-shaped copper object is a US penny
(7.5 mm diameter). There is a constant lighting circuit inside as well.