I know we have talked about these metal engines before but I can't find the thread. My guess is that these types are the first motors made but I would think that at least Geris, Jdog or Plarnold may know exactly.
EDIT:
Did find this thread http://www.blueplastictracks.com/showthr...etal+motor
EDIT:
Did find this thread http://www.blueplastictracks.com/showthr...etal+motor