Not sure if this is what you are refering to, but the ends of the GWR profile bar are hinged (hence the pulley system) so the profile will be different according to whether the ends are in the up or down position:
[from A History of GWR Goods Wagons A.Beard & Others]
Not sure of the reason for this!
I'm searching for more scale drawings of the GWR loading gauge, so your reference to Adrian Vaughan's book was very useful.
Loading Gauges (from Ratio Kits)
in Sixties Snapshots - 00 scale
A blog by Silver Sidelines in RMweb Blogs
Posted
Not sure if this is what you are refering to, but the ends of the GWR profile bar are hinged (hence the pulley system) so the profile will be different according to whether the ends are in the up or down position:
[from A History of GWR Goods Wagons A.Beard & Others]
Not sure of the reason for this!
I'm searching for more scale drawings of the GWR loading gauge, so your reference to Adrian Vaughan's book was very useful.
Thanks.