Large Scale Wire Color Code (NMRA DCC Standard)

Last Updated: 20 May 2023

Track Power

  • Black – Track, Left Rail
  • Red – Track, Right Rail

Motor Control

  • Orange – Motor (+)
  • Grey – Motor (-)

(Directional) Lighting

  • Blue – Lighting (+) Common
  • White – Lighting (-) for Front (Output 1)
  • Yellow – Lighting (-) for Rear (Output 2)

Other

  • Violet (or Brown) – Speaker / Other
  • Green – Output 3
  • Violet (or Brown) – Output 4

Source: NMRA S-9.1.1 (external link – PDF)