Standards (NMRA DCC S-9.x)

NMRA Standards provide the primary basis upon which interchange beween equipment and various North American scale model railroads is founded.  Under this requirement NMRA Standards include only those factors that are considered vital to such interchange.  All Standards must be complied with in order for a product to be awarded an NMRA Conformance Warrant.  Over 90% of the NMRA membership voted in favor of adopting the DCC Standards in 1994.