MEW (Model Engineering Works) in the Tinplate world is known for replacement wheels ...in the scale world an importer of HO brass trains . Dick Wheeler in 1964 tried to combine the two worlds by importing a brass steam engine in " standard gauge "... Scaled to 7/16" .
The demand for 2 rail, 2 1/8" gauge , DC powered , requiring scale profile track with a minimum of 48" radius found a rather small audience.
Dick Wheeler called his 7/16" line "Mantle piece models" .....most of the 50 or 75 engines made never left the mantle.
To see the MEW Colorado & Midland brass standard gauge engine in motion please see link
Cheers Carey