By the beginning of the twentieth century the residential development hoped for was at last proceeding. Trains on the circle were running at ten-minute intervals, the highest frequency outside London, and despite the electrification of the street tramways, business was booming. There was pressure for more trains, but the limitation was the limited accommodation at Glasgow Central. Fares were lowered and for a time revenues suffered, recovering somewhat from 1907. Incidentally there were no trains on Sunday on the lines (until 1962).