Sight card
An overview map is a way of public transport that are not canceled , but only needs to be pre-shows. Usually these are season tickets or tickets that were purchased in advance at the ticket machine . With the passenger flow principle , holders of sight cards could often get on with the driver, while cash payers could only get on with the conductors . If the railcar of a two-car or multi-car train operated entirely without a conductor, this was sometimes explicitly referred to as a sight card car .