In 1917, the two lines were separated when the LNWR began its 'New Line' service between Euston and Watford Junction, which the Bakerloo would share north of Queens Park.
I 1917 blev de to baner adskilt, da LNWR begyndte sin 'New Line'-betjening mellem Euston og Watford Junction, som the Bakerloo delte med nord for Queens Park.