I guess this was the normal Flask train through the 70’s and 80’s. I saw this formation many times at Ipswich, to and from Sizewell.
The Brake van is a slightly modified Hornby, The two barriers wagons (RNA) were made from Bachmann HEA’s with resin tops replacing the hopper. I believe the tops were to add weight to the wagons and were steel or concrete or a combination of both. I believe these tops were supplied to me from Appleby Models and are in resin.
The flask (FNA) itself was again I believe from Appleby and was in resin. I used Fox transfers for all wagons.
In these days, the train was hauled by a single loco – usually a Stratford 31 or 37.