Model Railroad Standards

Last Updated: 3 September 2022

Scale

  • MOROP NEM 010 – Scale & Gauge – PDF EN / PDF DE
  • NMRA S-1.1 – Scale & Gauge for Proto and Fine Scales – PDF EN
  • NMRA S-1.2 – Scale & Gauge for Standard Scales – PDF EN

Rails

  • MOROP NEM 110 – Tracks and Switches – PDF EN / PDF DE
  • NMRA S-3.1 – Trackwork for Proto and Fine Scales – PDF EN
  • NMRA S-3.2 – Trackwork for Standard Scales – PDF EN
  • MOROP NEM 120 – Rail Profiles – PDF EN / PDF DE

Wheels

  • MOROP NEM 310 – Wheel Sets – Suited for NEM 110 – PDF EN / PDF DE
  • NMRA S-4.1 – Wheels for Proto and Fine Scales – PDF EN
  • NMRA S-4.2 – Wheels for Standard Scales – PDF EN

Rolling Stock

  • NMRA S-2 – Couplers – PDF EN
  • MOROP NEW 301 – Perimeters of Standard Gauge Rolling Stock – PDF EN / PDF DE
  • MOROP NEM 800 – Railroad Eras – PDF EN / PDF DE

Layout

  • MOROP NEW 102 – Clearances for Standard Gauge Railroads – PDF EN / PDF DE
  • MOROP NEM 104 – Clearances for Narrow Gauge Railroads – PDF EN / PDF DE
  • MOROP NEM 122 – Cross Section Track Bed Standard Gauge Railroads – PDF EN / PDF DE
  • MOROP NEM 123 – Cross Section Track Bed Narrow Gauge Railroads – PDF EN / PDF DE