steam rollers reminded me of the 'road trains' which were drawn by
the rollers when a new road repair was undertaken.
The roller would pull a work cabin on
wheels, and a tar boiler to the site.
The "watchie" would set up camp, coke
brazier, warning lamps etc and the road gang would turn up from
somewhere, make tea in syrup cans (swung
round by their wire handles to settle the leaves - no tea bags
then) and begin work such as lifting tram tracks or repairing them.
See the Slateford Road picture below."