Lines & TimesSince the introduction of line numbers in 1912 the basic numbering was never changed. Of course during the years changes occurred. Often a line had variations making it necessary to add an indication to the route numbers. This was done with the use of one or two dashes through the route number or adding an "E" in superscript behind the route number. It also happened that a variation got a comlete different line number or two lines had a large part in common. For the overview all these variations are kept together on the same page. For each line the history, included the pre-1912 history, and the characteristics as time-tables and types of used cars are given.