Street car track construction

Filey/Howard/Weyerstrahs; Passengers Must Not Ride on the Fenders, Green Tree Pub. 1974

There are better versions of this picture around, but in April of 1923 TTC crews replaced this tangle of streetcar tracks at the intersection of Queen, King and Roncesvalles streets overnight. The intersection had been designed and constructed offsite then moved down to be installed. 
Things are pretty efficient with all the modern equipment but I'm not sure that this could be accomplished today.