@dkdkrd posted:Well, I did check the standards. My computer screen sez that "O" scale is 0.688" ± 0.031".
But, as others have reported, and as I have experienced for years and years, the O3R coupler alignments across car styles, generations, materials, manufacturers, etc., etc.,blah, blah, are all over the map within, perhaps, ± 1/8"....or more?
So, if Kadee's O scale coupler gauge is relevant to O3R and O2R, you'd think someone...even, or especially Kadee...would've offered a "Lobster Claw" version of that gauge. Yes? No? I mean, the O3R market is a tad larger than the O2R market...IMHO, of course.
Why would Kadee, who, in theory, want you to purchase THEIR products, produce a height gauge for someone else's products? Note that the standard is from the top of rail to CENTER of the knuckle, so it "should" be applicable no matter what type of coupler is used, Kadee or lobster claw.
