Changing the polarity with the locomotive polarity switch
Ensuring Proper Power to Track Polariy
For 2-rail DCS operation, it is important that the polarity from the transformer to
the engine is properly configured. Correct polarity can be accomplished by
ensuring that the wiring from the TIU to the track and orientation of the
locomotive when sitting on the track follows the illustration (shown below).
Changing Track Polarity Inside the Locomotive
Failing to properly configure the polarity will result in the locomotive starting in
reverse instead of forward or not receiving the DCS signal. Should this occur, it is
not necessary to swap the wires from the transformer to the track or reverse the
locomotive’s orientation on the track itself. Instead, simply slide the polarity switch
(shown below).
Proper 2-Rail polarity wiring and locomotive orientation
DCS Polarity Switch
Premier Chapelon 2-3-1E Pacific Steam Locomotive
4
To TIU Black Terminal
To TIU Red Terminal
