NMRA Standards for DCC

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Summary: This page contains a list of related standards for NMRA Digital Command Control

Standards and Recommended Practices

The best-known activity of the NMRA is the creation of Standards, and documents known as Recommended Practices (RP), for model railroad equipment. Many standards defined by the NMRA are widely followed by the industry and modellers, including their HO scale track and wheel standards (S-3, S-4) and related RPs (RP2, 8, 10-15, and 25), the Digital Command Control (DCC) standard set (S-9.1, S-9.2, and RP9.1.1 through RP9.3.2), and NMRAnet standard set (S-9.7) in development.

The main reason for the creation of the NMRA was to encourage inter-operability between manufacturers, which was a serious issue in the early days. Your trains may or may not have worked on a friend's layout. Today, thanks to the efforts of the NMRA, that is not a problem.

Digital Command Control

The NMRA Standards web page is the authority. The Standards, RPs, and TNs listed link to their page, and those links can change without notice.

This is a partial list of Standards related to DCC. For the latest revisions, see the NMRA Website.

Standards

Recommended Practices

Technical Notes


Layout Command Control