The National Model Railroad Association (NMRA) has Standards and Recommended Practices for various things for Model Railroads. These range from track spacing, wheel profiles, module specifications, and Car Weights. In this section I’ll post what the Standards are and also what the different models sampled measure up to.
Some manufacturers might not like me pointing out that their products are not within NMRA Standards, but they should be! If they are not within standards, the modeler should be aware of it so they can make an informed choice about their purchase.