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One Response to Flange Depth Code 70 Track
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AS usual, the NMRA Standards are the source for information. It says that, for HO, the recommended flange depth should be 0.047 inches (1.19 mm). That said, the maximum isn’t really possible to say for certain. Different track manufacturers might have different depth flange-ways on their turnouts or crossings. A loco might be fine on Atlas track and have issues with Peco (or vice versa). I’m not sure there is a defined maximum flange depth measurement standard.