To kick off, two CB&SCR examples, both put forward Dec 1910:
Large goods 4-8-0T
Boiler 5' 1 3/4'' dia.
Grate area 30.6 sq ft
Heating surface 1,786 sq ft
4 safety valves, on top of firebox
Max height from rail level 12' 10''
Driving wheels 4' 5'' dia
2 x inside cylinders 20 1/2'' x 26''
180lbs boiler pressure
Tractive effort 27,830lbs @ 75% pressure
Water 1,800 gals
Coal 3 tons
Weight 77T 5c
Cab profile to be the same as existing 4-6-0Ts so would look like an elongated, big boilered Bandon Tank with a squat dome and chimney.