Train wheel rim measuring tool - GIF

[Altair]

Train wheel rim measuring tool.




Previously:

Train wheelset dolly - GIF
Railcar wheel changeout - GIF
Overhauling locomotives in the 1930s - videos
Underfloor train wheelset lathe installation - video
Knuckle couplers engaging - GIFs

[nova_robotics]

What what aspect of the wheel are they measuring?

[Inner]

What what aspect of the wheel are they measuring?

This was my question too so I did some searching. While I could not find the exact product, apparently it is better described as a wheel profile wear measurement tool used in routine maintenance to measure things like:

Flange height
Flange thickness
qR—value
Wheel rim width
Hollow run
Double skin

(I have no idea what qR, Hollow run, and Double skin measurements are.)

Also, it looks like all the cool kids now use non-contact laser systems to do this same thing.

[Toolmaker51]

Pure guess; if hollow run is depression of wheel profile by crown of track, qR might be remaining usable radius.
https://link.springer.com/article/10...864-017-0072-2
Warning; the page bar is like a 1/4" high, ultra long page of text.
I'll await Cliff Notes, For Dummies book, or the movie.....

Double-skin? Well, that's best left to the baby boy's parents.....