Antelope Valley Model Railroad Club
Rolling Stock Standards

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The following standards are designed to facilitate interchange, smooth operation, and reliable performance of rolling stock on the layout of the Antelope Valley Model Railroad Club.

  1. All freight cars, passenger cars, non-revenue cars, and powered and non-powered locomotives must be inspected before they are first used on the layout, and annually thereafter. (If passed, they will be marked by the Club Technical Inspector with a distinctive mark on their undersides.)

  2. All cars must be marked with paint on their underside with the member's distinctive color code, as assigned by the Club Secretary. (Color assignments are listed on the roster.)

  3. All cars shall conform to the NMRA (National Model Railroad Association) RP-20 weight practice for HO scale, that is, 1-ounce plus 1/2-ounce for each inch of car length. (For example, a 6-inch car should weigh 4-ozs, and a 7-inch car should weigh 4 1/2-ozs.) Car weight should not be less than 5%, or over 10% of the standard. Non-conforming cars may be approved by the Club Technical Inspector, for example, in the case of a passenger/unit train.

  4. All weights, loads, and containers must be securely fastened to the cars so that they will not fall off when the cars are inverted.

  5. All cars must have body-mounted couplers; no talgo-mounted (truck mounted) couplers. Non-conforming cars may be approved by the Club Technical Inspector, for example, in the case of a passenger/unit train.

  6. All cars must have Kadee® or Kadee-compatible couplers, except locomotives that may have a dummy front coupler. All couplers must be in good repair, and be set to match the Kadee coupler height gauge within 0.03-inches (1/32-inch). Non-conforming cars may be approved by the Club Technical Inspector, for example, in the case of a passenger/unit train.

  7. All wheel flanges shall conform to the NMRA RP-25 wheel contour practice. Metal or plastic wheels are acceptable, but no dirty or worn wheels are permitted. (A worn wheel is a wheel having a sharp flange, or missing the proper contour.)

  8. All wheel gauges must conform to the NMRA S-4 wheel gauge standard.

  9. All cars must be able to roll down a 2% grade.

  10. All rear-end cars shall have a resistance of 12K-ohms between one pair of wheels. (This requirement is due to the type of detection system we use, and can be met by having a 1/8-watt, 12K-ohm resistor installed between the wheels on one axle.

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