With some time off for the holiday I've been able to complete assembly of my standard gauge Kingsbury single truck Birney. The project started with the purchase of a Kingsbury floor toy trolley that someone had already very carefully taken apart and removed the old friction mechanism from. Then I lucked into a loose McCoy mechanism at the local TTOS meet that came from a John Daniels GG1. I repaired the two failing wheels with cyanoacrylate (based on advice from repair expert Larry Pearson) and removed the plastic GG1 side frames.
Mating the trolley with the drive was accomplished by cutting several slots into the old trolley floor. I then added window glazing and a pair of bulbs, and the finishing touch was a pair of Ives pilots supplied by Bruce Peterson. I still need to strengthen up the floor a bit on one end- there's a big round hole where the old friction mechanism used to be and so the whole floor bends there.
This car joins the Kingsbury double-truck Birney motor/trailer set I posted about previously. Some photos and a video are attached.