Marsh worked under Ivatt at the GNR during the period when the ‘large boilered’ Atlantics were developed. He later joined the LBSCR and designed an Atlantic for them. When you look at the similarities between the two designs one wonders if Marsh had a spare set of GNR drawings in his brief case when he left Doncaster.
This is to our advantage as we are able to use many parts which are common to both designs and offer two types. Another reason for our choice has been the repeated request for a coal fired kit. Both these locos have the same wide firebox enabling those who have not previously coal fired to become proficient very quickly. Spirit fired kits are also available.
Today the GN version is represented by No 251 in the museum at York. None of the Southern versions escaped the cutters torch..
THE MODEL MAKERS KIT
These kits produced for those whose machining facilities or skills are limited or whose modelling time is at a premium.
The boiler is built, tested and certified. The cylinder units come as a ‘loose assembly’ with pistons and valves in place ready for you carry out the final assembly and seal it up. Items such as hand and axlepump bodies are pre assembled. The kit includes laser cut steel items, etched brass components, all machining done, pressure gauge, screws, nuts, rivets, ‘O’ ring seals, springs etc. to complete the assembly.
You will require a bench and vice, some hand tools, a drilling facility (which could be an electric drill on a stand) and a small gas torch for soldering. The work includes bending sheet metal, drilling piloted holes out to size, tapping threads in holes ( in many cases nuts could be used instead), soft and hard ( silver) soldering of small items.
The model making hobby is littered with part built projects which have been abandoned because the modeller has hit a problem. Included in the price are two hours of our time, a ‘get out of trouble’ service. It could be advice on the phone, a practical soldering training session in our works, correcting a mishap or setting valve timing. Apart from phone calls, a modest charge will be made for time spent over your two hours.
We can also supply replacements for individual components providing they are returned for us to identify. For etched items there will be charge depending on the size. Whitemetal returned with stamped addressed packing are free. Laser cut steel may be a problem as there are minimum order quantities involved and we shall only order a limited number of spares.
The Construction Guide comprises over 30 pages of photographs, exploded diagrams produced on 3D CAD and text, together with identification diagrams and drawings. It takes you through each stage, including jigs and methods, settings and adjustments, finishing with operation and use.
Scale : 10mm : 1ft
Length : GNR 597mm (23.5”) : LBSCR 610mm (24”)
Radius : Minimum 2.3m (7’ 6”) on G.N.R prototype.
Weight : 4.5Kg (10 LB) estimated.
Fuel : Alchohol (Methylated spirit) supplied by constant level feed system.
or : Coal, Anthracite ‘Grains’ about 6-10mm
Boilers : Internally fired, multi flue, superheated. with safety valve.
: Built from copper and bronze, silver soldered throughout.
: Tested to 200psi (13bar) Max. allowable working pressure 100psi (6.5bar)
Controls : Regulator, blower, pressure gauge.
: Spirit models have spirit valve and water level test cock.
: Coal models have water gauge and firing tools.
Cylinders : Two, 12.7mm dia x 22mm stroke (1/2” x 7/8”)
Valvegear : Slip eccentric, slide valve, between frames.
Lubrication : Displacement (Rosco) type.
Water feeds : Water carried in the tender which contains hand pump and bypass valve.
: An axledriven pump with its pipework, clack valve and boiler feed.
: High pressure ‘ball & socket’ coupling between loco and tender.
General : Loco suspension, buffers and coupling hooks sprung.
: Wheels and axles are to Gauge One ‘Standard’ dimensions.