Yes, these are basically 3V motors for use on battery power, but there was a whole range of them, from small to large. Originally intended for powered toys and models, but adapted for some of the early slot car systems, including Strombecker and Eldon. I think the Strombecker cars like that ran on 6V, not 12V, where they wouldn't have lasted long.
There's probably more info on here, under Kako motors, like this ad from the August 1959 issue of Model Maker, the British mag.