in an early 1950s timetable there were substantial peak period electric services on the main routes. departing between 5pm and 6pm there were four trains in the hour on broad street to richmond (the "north london line"), five in the hour on euston to watford (the "dc line"), and seven in the hour on broad street to watford. all these were scheduled for 6-car trains. a small number of the peak hour watford line trains were operated at the northern end directly to croxley green instead of to watford junction. in addition certain trains from the bakerloo line of the underground ran over the line from queens park to harrow & wealdstone or watford junction. the services were not on a particularly regular interval basis as there was the need for them to interleave with many other operations, and each other; in addition some trains were on a semi-fast basis, or skipped certain stations. the croxley and rickmansworth lines were normally operated by 3-car shuttle trains. the pre-war earls court trains had been similar.