Video 820: DCC Switch on MTH Proto 3, 3-Rail Locos

VIDEO LINK:  youtu.be/AfX7SavSJow or vimeo.com/370378341

GOOGLE DRIVE ALBUM #826 – has sketches & drawings for Videos #820 thru #826

(This page last updated 12/26/2019)

This page contains the MTH publication “Adding a DCS/DCC Switch to a Railking Engine”

Fig 1: DCC/DCS switch on MTH Premier Alco S2 (All Proto 3 Premier locos have this switch. Proto 3 RailKing locos do NOT have this switch.)

As I understand it:

•  Proto 1 locomotives were “sound-only”.
• Proto 2 locomotives added DCS capability, but did not run on DCC.
• Proto 3 locomotives were introduced around 2011, and added the capability to run on DCC.
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• All Proto 3 Premier locomotives have the DCC/DCS switch.
• The Proto 3 Railking locomotives from about 2011 to 2014 had the DCC/DCS switch.
• The Proto 3 Railking locomotives after 2014 no longer have the DCC/DCS switch — see below Fig. 2.
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• The Railking locomotives made after 2014 still have the DCC/DCS decoders, but in order to run the loco on DCC, you have to either add the switch yourself, or cut a jumper wire inside the loco.
• If you cut that jumper wire, the loco will then run on DCC, but not on DCS.
• Adding the switch allows you to essentially “disconnect” the jumper wire to run on DCC, or to “re-connect” that jumper wire to run on DCS.

Fig 2: Chart showing which MTH Proto 3 locos have the DCC/DCS switch.

Adding DCS/DCC Switch to Proto 3 Railking Locos:

Fig 3: Page 1 of 2 of the MTH instructions to add the DCC switch to a Railking loco. (The original PDF is in the Google Drive album.)

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Fig 4: Page 2 of 2 of the MTH instructions to add the DCC switch to a Railking loco.