The first photo below shows two motors from Superstreets/EZStreets vehicles. The motor on the left is visually identical (except for numbers stamped on the case) to those in nearly all 'Streets vehicles I have ever taken apart, from the very earliest metal chassis K-Line units hrough all the Lionel years to the current Bachman offerings. It is also used in the Lionel early era inspection vehicle, some Porters, and the clown cars. The motor on the right was used only, as far as I know, in a few K-Line by Lionel vintage trucks.
Does anyone know of versions of these motors, or a source of can motors of roughly these small dimensions, with a worm gear at one end and flywheels attached as shown in my edited drawing added to the lower photo? I am looking specifically for motors with only one flywheel and one worm gear, not one at both ends and flex shafts like many HO diesel drives have.