Three-rail
Williams E33, reasonably close to scale except for the height of the hoods, taller to accommodate the vertical can motors:
One of several Williams MTH and a Lionel scale GG1s that I have:
Two-rail:
Atlas AEM-7:
K-Line EP-5:
converted to two-rail; according to some, a better version than the brass one that was imported:
E44, unknown manufacturer, possibly Locomotive Workshop:
And an unknown scratch-built 1-D-1 chassis, this one is outside third rail:
One of several doorstop (heavy cast bronze) EP-3 and GG1 motors that own:
And finally, a trolley box motor built by Bill Robbins (of Nevada Short Line fame) that I now own: