Train wheel flange height and thickness caliper.
https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...491#post219419
https://www.homemadetools.net/forum/...635#post219885
https://www.homemadetools.net/forum/...872#post194453
https://www.homemadetools.net/forum/...632#post182482
https://www.homemadetools.net/forum/...220#post218346
