Talk:BR Standard Class 9F

Reduced flanges on 2nd and 4th coupled wheelsets: rv good faith edit - duplication

← Previous revision Revision as of 10:14, 20 April 2026 Line 84: Line 84:

:That reference is literally a forum - it's the opposite of a reliable source <span class="nowrap">[[User talk:Danners430|<span style="color: RebeccaPurple">Danners430</span>]] _{[[Special:Contributions/Danners430|tweaks made]]}</span> 10:13, 20 April 2026 (UTC) :That reference is literally a forum - it's the opposite of a reliable source <span class="nowrap">[[User talk:Danners430|<span style="color: RebeccaPurple">Danners430</span>]] _{[[Special:Contributions/Danners430|tweaks made]]}</span> 10:13, 20 April 2026 (UTC)
== Reduced flanges on 2nd and 4th coupled wheelsets ==
I made an edit in July 2024 which was subsequently reverted.
The reference I quoted https://modeleng.proboards.com/thread/14664/br-standard-9f-tyre-profiles is quite clear in that the depth of the flanges on the 2nd and 4th axles is identical to the 1st and 5th, but the flanges are thinner. These drawings are from an official British Railway document "MT 276" covering maintenance requirements for heritage and other privately owned equipment.
Maybe there is some misinterpration about depth vs. thickness of the flange on a railway wheel? Flange depth refers to the distance the flange protrudes from the adjacent tread of the wheel which contacts the rail. In the case of the relevant drawings for Profile A and Profile E, the flange depth is effectively 1.125". Flange thickness is measured horizontally in the direction parallel to the axle of the wheelset. The Profile E drawing shows a removal of material of approx. 0.125" from the back of the wheel resulting in the wheel flange being t [[User:UD123546|UD123546]] ([[User talk:UD123546|talk]]) 10:13, 20 April 2026 (UTC)