Early 19602 Mineral Flows along The Thames Valley

Hi All,
Around 1960-62, apart from coal, and its associated products plus the empties therefrom, what mineral flows were there along the GW main line between Acton and Reading or along the Wycombe branch, destined for or originating from beyond the Thames Valley area, a) in block formations b) as a section comprising c1-6 wagons of a mixed freightwagons?

Also in the same area and timescale, what were fitted bauxite 16T minerals used for as against unfitted grey 16T minerals?

Many thanks
Paul