In the autumn of 1926 the North British Locomotive company was asked by the LMS to design a new 4-6-0 for express passenger work. This was undertaken under the auspices of Sir Henry Fowler. The following February an order was placed for a batch of 50 to be ready for the summer. The first on was delivered in July. Following some initial teething problems the remainder of the order started to arrive in the autumn of that year. Such was need and the confidence in the design, no prototype was built. It appeared with the standard 3500 gal Fowler tender. A tragic accident at Leighton Buzzard in 1931 was thought to have been caused by restricted vision due to smoke and steam ‘clinging ‘ to the boiler. After trials to overcome the problem, smoke deflectors were introduced. Stanier’s arrival as CME saw further changes. The first was to the main axleboxes where his version, based on Swindon practice, reduced hot boxes from 80 to 7 per year. In 1936 some locos were fitted with his new high sided 4000 gallon tender, designed for the Jubilees. Following the unsuccessful high pressure experiments, Fury was rebuilt with the new 2A boiler in 1935. Fury was renamed British Legion. After a period of development the tapered boiler and double chimney was shown to bring considerable advantages to the performance and economy. A programme of rebuilding with the 2A boiler started in 1943. The last conversion was completed in 1955. Withdrawal started in 1962 and finished in 1965.


THE MODEL

     These kits are for the original large boilered version. They can be built with or without the smoke deflectors. The original 3500 gallon tender which is easy to build is standard. The more difficult Stanier 4000 gallon tender version has now become available.  In common with our other designs, the working valvegear will be a robust, slip eccentric, protected between the frames. The outer Walshaerts valvegear will move in a prototypical manner but not be functional, what has been referred to as ‘Bullshaerts!  


LOCO SPECIFICATION


 Scale:-                  10mm to 1 foot

  Length :-               637mm (23.25”)


  Track radius:-        7’6”ft minimum


  Weight  Kg           (  10 -12   lb ) Approx


  Fuel :-                   Alcohol  (Methylated spirit) supplied by constant

                               level feed system.To ‘toast rack’ style wick burner.


  Boiler :-                Internally fired, multi flue, superheated, with safety valve.

                              Built from copper and bronze, silver soldered throughout.

                             Tested to 200psi  (13bar) Maximum safe working pressure 100psi (6.5bar)


 Controls:    loco:    Regulator, blower, low water level  test valve, pressure gauge.

               tender:    water pump bypass,  fuel valve.


 Cylinders:-            Two, 1/2” bore x 7/8” stroke ( 12.5mm x 22mm)


 Valvegear :-          Slip eccentric, slide valves


 Lubrication :-         Displacement (Rosco) type.


 Water feeds:-        Tender carries water in rear tank containing  hand pump.

                               Loco has axle pump driven from driving axle.


  General :-              Buffers and coupling hooks sprung.

                              Main loco axleboxes individually sprung.

                              Bogie axle boxes sprung.


LMS Royal Scot
Production 90%, Components available now