The build
Assembly starts with the wheels.
The idler wheels parts with assembled one top left.
Drive sprockets with assembled one bottom right.
And finally the nine-part road wheels again with assembled one bottom right.
Next are the suspension units…
The parts for steps three and four.
Partially assembled…
The next picture shows the pins to connect the suspension arms, one of the stand-offs for the side plates and a return roller.
Jack Black says
Page 3, 3rd photo. Surely the bogie main body is upside down?