Banking Locomotive

A UK term meaning a locomotive used to assist trains over an uphill section of line incorporating a long or steep 'bank'. Many banks had permanent allocations of 'banking engines', which were attached to the rear of trains which stopped specially to pick them up. At the end of the section where assistance was required, the banking engine would drop off without stopping the train and later return to the bottom of the bank to assist another train. In US known as 'helpers'.