Hello all ..in the mid 30's there was such a stigma about the term "standard gauge" .....that NMRA and some modelers thought it would be best to call "standard gauge" 2" gauge ...yes even if it does measure 2 1/4" ......very confused folks ..G Vaughn one of the prominent "standard " gauge builders .... his pieces are referred to both as 2" and standard ... (remember a committee like the NMRA could not even figure out the correct scale for O gauge 1/4" ok even if 17/64ths is correct ) . Here you have two of Vaughn's pieces ..one standard ..one 2" .....both run on the same track ... both are standard gauge ....and modeled to 3/8" scale .
Cheers Carey