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The 17 German engines were converted to primary oil-firing between 1977 and 1983, and together with the DRG Class 99.22 are the most powerful German narrow gauge steam locomotives ever constructed. They were later converted back to coal-firing and are primarily used on the line up to the Brocken from Wernigerode .
The point of sale (POS) or point of purchase (POP) is the time and place at which a retail transaction is completed.At the point of sale, the merchant calculates the amount owed by the customer, indicates that amount, may prepare an invoice for the customer (which may be a cash register printout), and indicates the options for the customer to make payment.