The NEM standards cover areas similar to the standards and recommended practices defined by the National Model Railroad Association (NMRA) in the United States, but the two standards are not universally interchangeable.
NEM-normerne dækker i store træk over de samme områder, der defineres i normer og anbefalede praksis af den amerikanske organisation National Model Railroad Association (NMRA), men de to sæt normer er ikke fuldt kompatible.