....
....the basic Rolling Stock Library outline diagram should be available on the Barrowmore MRG site.
Have a look at page 53. Remember it is always better to cross check dimensions shown on these diagrams where possible.....
http://www.barrowmoremrg.co.uk/BRBDocuments/BRPOWagons1Issue.pdf
I have a 1964 Eastern Region Freight Trains Load Book of the type issued to guards at this time. Special mention has been written into the spaces under class 4 trains of the Cliffe to Uddingston working of these wagons..."brake at each end, roller bearing, 32 light alloy wagons via Ferme Park, D15/6 loco (1550 HP class 3 loco)". Class 4 trains running at 55mph had to have a minimum 90% of the wagons fully braked....brake vans had to be fully fitted or piped & gauged only and must have a wheelbase of 15ft or more.
I last worked a rake of these from Ditton (ex Widnes) back to Earles sdgs via Weaver jcn & Northwich in the mid eighties driving 45034 when secondmanning Dennis Morton of Buxton shed. 50 mph 'vacuum passenger' braking/brake rate selector position. Have a picture somewhere taken in Ditton yard....I'll look it out...picture found but it was of the engineers trip which took us to Ditton from Guide Bridge and doesn't show the cement tanks. The rake of Cemflos just happened to be stabled there and we volunteered to take them back to Earles....not a regular sight though via Northwich as they used to run via Lymm in the booked working.
Here is one that I took at Chinley at a similar time https://www.flickr.com/photos/43564631@N08/4569699681/in/album-72157622730543368/
Dave