Hi Martin and Phil,
More prototype questions if you don't mind. Would either of you know by any chance, if the permanent way side railways adapted the change from the old BS190 standards for bolt sizes to the newer BS1083 standards? And if they did adapt the new standard, any likely dates for the change?
I believe the reason for the change in Bs standards was to save on material and the new BS1083 was introduced in 1924, so It could well have been as part of the 1926 REA standards.
That is assuming they did adapt the new BS standard. (not a given for the railways), As I believe they did not adapt the change for boilers
The next question is the obvious one what did the GWR do?
cheers
Phil,