The rear wheels was a bit complicated construction containing a lot of parts.
And since I know you all loves wheels,just as me!! I made a step by step report....
First lets take a look at the drawing.Ans as we can see it's a lot of parts involved.
First step was to make the rear side.It was made of a 0,5mm bottom plate,a center hub, and two coned pieces coned each way.

The triangles was glued to the lower cone and the hub.
Then I made the cone for the front side arrangement
Then I added the ring with the nuts to the rear side.
The cone was glued to the front side
And the nuts was added to the rear side
So came the time to add the supporters for the outer ring on the front side
All 6 supporters added
Then I had to put on the paperstrip and the ring to hold the coned front part in place
The outer part was added to get the distance from the rear ring correct for the dimesnsion on the outer coned part.
The coned outer ring is in place
A lot of tiny triangles was to be added to the outer coned sides
And when all triangles and nuts are added we have a wheel
I painted the part that will be in contact with the tracks with "polished steel" paint
The wheels put loosely on for an impression of how it will look.
