At the age of 5, Hornby's "Freightmaster" train set, containing an oval of Super-4 track, a Triang Class 31 A1A-A1A and five wagons plus brake van. The controller wasn't a mains one, but had to be mounted on top of two bulky Ever-Ready 6-volt batteries. These:
https://www.google.com/aclk?sa=l&ai=DChcSEwjHjInBq4v8AhUKnu0KHVKYBAUYABAVGgJkZw&ae=2&sig=AOD64_18jd7aTg96-Q_NJQa0zrYMsxAz9w&adurl&ctype=5&ved=0CAIQz7YHKApqFwoTCPiu38Sri_wCFQAAAAAdAAAAABAD
The control lever lifted out from the hub of it.
The rest, as they say, is hysterical.