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At the start of every shift the conductor checks their ticket blocks and writes down the first ticket serial number of each block in this journal. At the end of the shift, they write down the final numbers. By subtracting the new number, they will know how many tickets have been sold, and therefore how much money they should have in their bag.
People usually paid with cash, but their were also monthly tickets, school term tickets, etc. The Electric Supply Company also used Bakelite tokens which could be purchased from the tramway office in bulk, and then used on the tram instead of cash.
These days, the use of cash has declined, and most people use credit cards and EFTPOS devices. At the BTM passengers pay for their ticket at the Museum, and are then given a plastic “coin” to buy a tickets from the conductor on board the tram.