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MSS Standard
The Modular Signal System has been standardized to ensure commercial products are developed to successfully inter-operate.

Only products that comply to applicable sections of the MSS Standard are considered MSS compatible.

The MSS Standard V2.0 was released in October 2015 by the MSS Standards Working Group and is available here in PDF form.
copyright 2005-2017
Modular Signal System - MSS
Modular Signal System
Standard V2.0.2
Note: The V2.0 Standard supercedes Gregg Fuhriman's magazine article in the February 2005 Rail Model Journal (page 8), considered "MSS V1.0".