I know this is an old and older thread, but I was offered a rail truck and trolley by the grandson of a modeller who passed away a while ago. Turned out they were Northeast Narrow Gauge kits, built up. The trolley says "Northeast Narrow Gauge" in the sign board, so I wonder if that was supplied or bought as a built-up kit.
Which lead me to the Tin Lizzy Crafts page of Michelle in Luxembourg:
Where you can peruse the 1989 catalog. This is the trolley page.