The main chassis is in 2 parts. From the upper fret the w-irons fold
down, and in which the bearings can slide up and down. These are
linked by cross beams pivotted on a longitudinal wire. This also acts
as a torsion spring between the two axles. There is a lower fret which
acts as the underside of the chassis framing. Â This carries the spring
castings, and locks the assembly together. Between these 2 etchings,
whitemetal ballast weights provide some usful low down weight,
particularly for plastic open wagons. The wheel bearings are carried in
plates behind the w-irons which bear upon the arms of the crossbeams.
Further torsion wires link each crossbeam to the chassis. Thus if
one axle rises, it is resisted by the body on one side and by the other
axle which is similarly fixed to the body. This means that the body will
take up a deflection half way between each axle, and that the relative
movement of one axle to the other is independent of the body weight.
The chassis is easily fitted by glueing to the underside of the
floor of any plastic or whitemetal kit, as well as to many proprietry
models. It has a depth of 3mm (9 inches prototype) so that some packing
may be needed for use with 10 and 12 inch types. Before assembly of
the body kit, check that there will be adequate space between the
For further information, please look at the Assembly instructions
below. The file opens in a new window, and may be downloaded. I shall
also be updating it from time to time.