A question about wheel rims

Hello there

One of the (many) things I`ve notice by looking at steam locomotives wheels is the difference in shape and thickness of the wheel rims.
Take or instance the LMS (or the BR standards) vs. the LNER ones. Locomotives at the LNER seems to prefer the thinner almost D shaped wheel rims (seen cross sectional) where the outside egde is hidden behind a lip on the tyres. The LMS locomotives (and later the BR standard ones) have this triangle shaped , more solid wheel rims.

Why this difference? Was it any practical/ mechanical reason or just a "tradition" from each engineer (or maybe company)?

Knut

 

The "triangular shaped" rims are Stanier V-rims later adopted by B.R. Before Stanier the LMS rims, often referred to as Fowler rims. were similar to everyone else's. Hope this helps.
Ray.

 

Thanks for your information Ray!
Perhaps these V-rims were more solid than the thinner D-shaped since they were adopted to the later BR standards? Or maybe it was just a chanche.