NMRA 標準と推奨慣例
本書は全米鉄道模型協会（National Railway Model Association; NMRA）の「標準と推奨慣例」を翻訳したものです。
ソースリポジトリー https://github.com/kakkun61/nmra-ja/
- S-9.1 Electrical Standards 完了
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NMRA は現行の情報に対して5種類の技術文書を使用します。
The NMRA, in its standards and recommended practices, addresses only the specific standards and recommended practices for model railroads. These standards and recommended practices do not address any legal requirements. It is the responsibility of the manufacturer to determine if their product conforms to all applicable governmental laws and regulations.
標準（Standard; S） - NMRA Standards are to establish the broadest correlated set of limiting dimensions, electrical parameters and communications parameters within which interchange may be assured. Standards are reviewed by the membership and approved by the Board of Directors.
推奨慣例（Recommended Practice; RP） - NMRA Recommended Practices do not rise to the level of being a Standard, however, they provide details of various topics that have been found to be the best for interchangeability or operation of products. Recommended Practices are not used in determining the qualification of a product when compliance certification is being judged. Comments are generally made if the product is found outside the recommended practice. Recommended Practices are reviewed by the membership and approved by the Board of Directors.
技術的注釈（Technical Note; TN） - NMRA Technical Notes supplement the Standards to provide additional guidance on a given subject. Technical Notes are reviewed by the appropriate technical working group and approved by the Manager, Standards & Conformance.
技術的情報（Technical Information; TI） - NMRA Technical Information are documents that are used to provide information associated with a Standard or Recommended Practice. Technical Information is reviewed by the appropriate technical working group and approved by the Manager, Standards & Conformance.
技術的参考文献（Technical References; TR） - NMRA Technical References are, for the most part, internal documents that provide a history of action taken in the Standards and Conformance Department. Occasionally a Technical Reference is made public for reference and use by individuals involved with the Standards and Conformance Department. Technical References are reviewed by the appropriate technical working group and approved by the Manager, Standards & Conformance.
TODO