There are very few O gauge prewar trolleys that I know of. The only operating American made one that comes to mind is the Ives "Suburban" trolley. I think it came both electric and windup... But I'm not the Ives expert.
There are a few European O trolleys. Bing made a beauty.
Pride Lines made a prewar style O trolley.
There is the tin Broadway trolley by Chein. And a Main Street trolley by Mohawk. But neither are motorized. Both of these are close to "O scale".
I motorized a prewar litho Chein Broadway trolley. Powered by the motorized truck from a handcar. I use a Z-Stuff auto reverse for back and forth operation. Not "original", but it has the right look.