Western Region Engine Loads - 17th June 1963 Until Further Notice - (10.1MB).
This covers just about all the GWR/WR routes existing in 1963 (including the Withered Arm, and also the routes in the north, such as the old Cambrian lines, that were not part of the WR by this time), and in addition to steam also has diesel loadings including those for the twin-engined hydraulics when running on one engine.
PDF - WESTERN REGION ENGINE LOADS 17TH JUNE 1963 UNTIL FURTHER NOTICE.pdf