Indian locomotive class PT

The Indian locomotive class PT (Passenger Tank) was a class of 2-6-4T broad gauge passenger tank locomotives, one of seven standard broad-gauge locomotive designs developed by the British Engineering Standards Committee for the broad-gauge railways of British India. It was first catalogued in the second edition of the BESA report of 1907. Robert Stephenson and Company built seven PT class locomotives for the South Indian Railway in 1936, bearing works numbers 4114 to 4120. This batch differed from the earlier F and FS classes by being fitted with outside cylinders and, unlike the design recommendations of the report, with external Lentz rotary valve gear. In service they were used in heavy suburban traffic and were numbered 7 to 13, and number 11 has been preserved at the National Rail Museum of India in New Delhi.