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The best-known activity of the NMRA is the defining of standards, and advisory documents known as Recommended Practices (RP), for model railroad equipment. Many standards defined by the NMRA are widely followed by the industry and modellers, [citation needed] including their H0 scale track and wheel standards (S-3, S-4) and related RPs (RP2, 8, 10-15, and 25) and their Digital Command Control ...
The DCC protocol is defined by the Digital Command Control Working group of the US National Model Railroad Association (NMRA). The NMRA has trademarked the term DCC [ citation needed ] , so while the term Digital Command Control is sometimes used to describe any digital model railway control system, strictly speaking it refers to NMRA DCC.
March 2024) (Learn how and when to remove this message) C/MRI (Computer/Model Railroad Interface) is a set of electronic modules that allow a computer to monitor and control real world devices, including those used in conjunction with model railroads.
In certain NMRA scales an alternative designation is sometimes used corresponding the length of one prototype foot in scale either in millimetres or in inches. For instance, 3.5 mm scale is the same as HO. For HO and O-scales, NMRA uses the letter "O" whereas NEM uses the number zero (H0 instead of HO).
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The National Train Show (or NTS) is held as part of the annual National Convention of the National Model Railroad Association.Held in a different city each year, it consists of railfan and model railroading products, and model train layouts created by clubs.
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