The BPT class were steam hauled cars converted to electric train service. They were converted from the _BP_ class.
There were twenty eight cars converted in 1919. The numbers were: 1 - 18, 20 - 27, 29 and 31.
With the suburban stock recoding of 1921, the BPT cars were reclassed to _T__, with new numbers. The recoding took place during 1921/1922.