Mdc Rs-3

Discussion in 'HO Scale Model Trains' started by Glen Haasdyk, Feb 24, 2007.

  1. Glen Haasdyk

    Glen Haasdyk Active Member

    I picked up a used MDC/roundhouse RS-3 at a swap meet a little while ago. It was complete except for the couplers. the couplers seem to be attached to the frame with small screws that would go through the draft boxes, frame and then into the shell. They also seem to be what keeps the shell on. Does anyone know the size of screws that are required?
  2. doctorwayne

    doctorwayne Active Member

    Glen, I don't know for sure, but it seems that a 2-56 screw would be a logical size, as that's the proper size for mounting Kadee draft gear boxes. My second choice would be a self-tapping screw, not because it's a particularily good choice, but rather because MDC did use them on a lot of their rolling stock kits. :rolleyes:

  3. Ray Marinaccio

    Ray Marinaccio Active Member

    I'd have to hunt for the extra shell I have to be sure (it's never been used), But I do believe Wayne is correct.
    (Edit) I just looked up the part sheet and it states they are #90008 #2x1/4 screws.
    Then I looked at the other part sheets I have and found #90008 listed as a #2x1/4 self tapping screw.
  4. Glen Haasdyk

    Glen Haasdyk Active Member

    Thanks Ray and Wayne I'll be getting those screws tomorrow if possible.
  5. jeffrey-wimberl

    jeffrey-wimberl Active Member

    It does indeed use 2/56 screws. These only hold the coupler and cover plate, not the loco shell. I have two of these unit and on both the body shell snaps on.
  6. Glen Haasdyk

    Glen Haasdyk Active Member

    Now I'm a little confused here. there are no snaops that hold my body shell on. the sell slips over the motor and geartrain and sits on the top of the frame. there are cast and threaded holes in the shell directly in line with the holes on the coupler mounts on the frame.
    I assumed that this was an MDC RS-3 since it's using a complete Athearn drivetrian including a gold motor.
  7. Ray Marinaccio

    Ray Marinaccio Active Member

    Is there one or 2 screws to hold each coupler pocket? If there is only one, you may have a Stewart RS-3. The MDC has 2 for each.
  8. Glen Haasdyk

    Glen Haasdyk Active Member

    There is one. as I said it goes through the coupler pocket (which isn't there) the coupler pad on the frame and into the cast-in hole on the body.
    maybe it is a stewart unit. I hadn't even considered that. I supose they used Athearn componts as well? If so, to get back to my original question, what is the size of the coupler/ body mount screw?
  9. Ray Marinaccio

    Ray Marinaccio Active Member

    Are the air tanks cast onto the sides of the fuel tank? if so it is a Stewart.
    I used #2x56x5/16 screws on mine.
    The MDC RS3 has plastic add on air tanks.
  10. Glen Haasdyk

    Glen Haasdyk Active Member

    Mine are cast on so it must be a stewart. Thanks for your help.
  11. joesho

    joesho Member

    pitures??? shounds intresting tho.

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