LMS 3F 0-6-0T

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All contents (including photos and drawings) - ©  2020 Derek Mackenzie LMS 3F 0-6-0T - Kit or Ready-to-run     10mm scale  See the Wikipedia page for further details GWR Dukedog 4-4-0 9017, Earl of Berkeley LMS 3F at Spa Valley Railway

Based largely on the ARM1G design this has a modified boiler with a working dome that feeds the remote safety valve and increases water capacity. The cab is mostly clear with a low mounted poker burner and the regulator below the footplate. There is no backhead as this is barely visible within the cab and would have pushed the cost up. This could be provided 3D printed in a high temperature tolerant plastic resin (at extra cost) if you really want it - I have not got round to modelling it yet. Only needs a driver figure & fireman to complete the effect. They would also help to hide the poker burner. It would be good to have the driver leaning out of the cab with a rotating head linked to the reverser so that he looks in the direction of travel - no prizes for the first to do it!

Like all of my current models this is entirely made of nickel silver with lost-wax brass castings made from 3D printed masters, copper boiler, thick walled brass gas tank and, in this case, cast-iron wheels. The boiler uses a single flue with a poker burner that is remotely adjustable for idling.

The model is radio controlled only - no manual option - it would have involved too many compromises.

See here for more details of the R/C system. It provides controls for the regulator, reverser, idling the burner and uncoupling. It also provides feedback on speed, boiler pressure, water level and battery voltage with warnings when pressure goes too high, or voltage or water level too low. The system is fully integrated at no extra cost.

 Boiler  1.625" diameter x 6.46" long, single 0.75" flue    

   water capacity 6.6 cubic inches - almost identical to the ARM1G design  

   regulator valve - radio controlled, mounted below footplate   


 Burner  Poker type for 3/4" flue - similar to the Roundhouse type    

   secondary gas control valve for idling - radio & computer controlled    


 Gas tank  Rectangular brass filling the bunker - approx. 2.8" x 1" x 1.5"   

   gas capacity 3.4 cubic inches - 60% of ARM1G capacity    

   primary gas control valve (on/off) - top feed     


 Cylinders  ARM1G design - some improvements     

   2 x 11mm bore x 17.6mm stroke     

   remote reversing & variable cutoff via Southern valvegear - radio controlled  


 Alternative oscillating steam motor (OSM)      

   2 x 11mm bore x 12.4mm stroke Double acting, 1:2 reduction gear  

   remote reversing via shuttle valve - radio controlled    


 Radio controlled couplings       


 Construction - etched nickel silver sheet, lost-wax brass castings, customised transfers to user requirement

   Painted to customer's requirement     


Unlike the majority of Gauge 1 locos which spend their entire time going round in circles (usually at excessive speed)

this locomotive has been designed from the outset for use on an end-to-end branch line. Of course it can still do the

above mentioned circles.        

The objective is to remotely control the loco so that it can do everything that a real life branch line loco can do - e.g.

 running round the train at each end of the branch     

 shunting mixed goods at intermediate stations      

 waiting in "idle" mode for connecting trains at the branch junction station   

 acting as station pilot        

all easily done with an electrically powered model, but rarely emulated with steam power.   


Availability As soon as I have got the prototype satisfactorily proven. It has been held up by the ongoing

   development of both the T9 and the radio control system   


  Note the radio control system is operated by a user supplied mobile phone or tablet