The description on these Alcan photos says "167 ton casting from Sheffield to Rogerstone via Coventry, Buckingham, Bicester and Chipping Norton. Presumably it was off loaded for the rail crossing at Gloucester.
The date is April 1960
Diamond T 266/PDW321 is leading followed by Pacific 193/HDW122.
In the second view another DT 212/HDW572, Wynns 9th, a 981 model, has arrived - on tradeplates!
It would have been an experience to watch this going through the Cotswolds.