Usually when I start a loco build, I start by making up the coupling rods in preparation for aiding with the assembly of the chassis. On a whim, I decided to build the trailing truck and the bogie first.

First the trailing truck.

The truck is in two parts an outer and an inner which holds the axles/wheels. As it comes in the kit it’s a fold up frame with the front yoke as separate etches that you assemble to create the I frame.

I am working from the Wild Swan Loco Profile book N0 4 The Princess Royal Pacifics and aside from photos and historical information about the development and changes to the locos over time it also contains a number of General Arrangement Drawings. One of sets of drawings is for the trailing truck and shows the differences between the first two and the main production batch. 6206 is from the latter. What is clear from the drawings but not from photos (because you only see the sides not the ends) is that the front and back of the truck is also I beam type construction. I decided to add this from 10 thou nickel sheet cut with the guillotine. You can see the first piece in place on the photo above.

The inner truck is a basic fold up box that you add a couple of nuts to and then fit bearings. Although it cannot be seen from any angle unless you turn it upside down the drawing shows that there is some kind of side control mechanism so I decided to turn a basic representation of it from a couple of pieces of brass rod.

Lastly the truck assembled and ready to fit to the chassis at some future point.

The additions have also added a little more weight to the truck so with luck I may not need to try and find room for some lead later on.