The British Railways "Britannias" were introduced in 1951 and would eventually number fifty five of which all but one were named. A brand new design, the Britannias were initially used for express passenger duties and rejuvenated the services on certain sections of British Railways.
A scale model with a choice of piston or slide valve cylinders, it is nevertheless an easy to machine and construct locomotive.
| Sheet 01 General arrangement & main frame | Sheet 08 Brake gear details |
| Sheet 02 Main frame stretchers | Sheet 09 Boiler arrangement |
| Sheet 03 Driving/coupled wheels & main axleboxes | Sheet 10 Superheater & smokebox |
| Sheet 04 Piston valve cylinders | Sheet 11 Reverser & firegrate |
| Sheet 05 Slide valve cylinders | Sheet 12 Locomotive superstructure |
| Sheet 06 Valve gear details | Sheet 13 Tender arrangement & running gear |
| Sheet 07 Bogie & trailing truck | Sheet 14 Tender superstructure & pipework |
Castings available include :-