I think this is the most difficult loco I have made so far.
There are all sorts of little problems in the body work. Hand-fretting the running plate valence, and then bending the running plate to match was interesting, but making and fitting the splashers over the trailing driving wheels was more difficult. I had three or four goes at that before I finally achieved a result I as happy with.
The boiler fittings are all hand turned to a basic shape, and then finished off with a burr to match the shoulders to the boiler. The safety valves are an assembly of several separate parts, soldered together with lots of low-melt to fill the gaps, before hand finishing to shape.
Most of the detail on the loco is complete, but still lots of work to be done on the tender.
I have to say that I have cheated a little, and have bought the white metal fittings for the tender from London Road models. I couldn't face scratchbuilding six axleboxes and springs.
The chassis showing the basic layout. It is very similar in design to Victoria's chassis - side-beams for the driving axles, and a fully compensated bogie (providing the third suspension point) with a simple pivot to hold it in place.
There is side play on the leading driving axle, but none elsewhere.
Pick up uses split axles as usual, but just on the driving axles. The pick-up wires are soldered to the axle bearings on the driving wheels, but have not yet been soldered to the side frames.
The back end. The motor is a Portescap 1616 with standard gearbox, but heavily cut down and sloping backwards to get it in the firebox.
A view from the underside. The construction of the bogie can be clearly seen - an assembly of bits of tube and rod.
The very simple tender chassis, showing the very basic side-beam compensation on the two trailing axles. The tender will be heavily weighted, and hang off the back of the loco to balance the weight in the smokebox.
I may need a bit of weight or a spring on the leading axle to keep it on the track.
And finally, the (almost) finished loco, in Billinton Umber. At a late stage in the process, I decided to produce this B4 as ‘Norfolk’. I have recently been given a London Road Models kit of a B4, so this will eventually be turned out in Stroudley’s Improved Engine Green, as ‘Holyrood’.