As a child, who built one of these?

[Bob Culver]

In the early 50s wheels were the great problem. Now there are sources everywhere but children do not trouble. In a flat town had to push and pull each other. My last schoolboy model had swing axle irs. At that stage towed by bike. My Dad also towed me along the much patched road by our house. I was intriged by the constant movement of the Seven shackles. With a steep drive, made one for my son using mower wheels, but drifting  collapsed them. I guess i was a bit too heavy.
The essential rule is to maintain both steering cords tensioned at all time.