This thread got me wondering, so I got my "Beep" out of storage, ran it, and took a look under the shell.
Appears I may have the older version as well, but it runs fine for me, controlled starts and good speed without a load.
The weight plates have some surface rust that I'll clean up before repacking.
Now I recall why it's not a favorite, jerky operation on my RealTrax turnouts, a behavior that will keep it in the box.