In the early 1860s, John Chester Craven developed a standard heavy freight train type that was to be built in larger numbers with only minor variations. These were six-coupled machines with outer and inner frames, internal cylinders and Stephenson valve gear. They were manufactured at LB&SCR's Brighton works.

Fifteen examples were built between 1863 and 1867, with cylinders measuring 16 by 24 inches and a wheel diameter of five feet. The running numbers were between 157 and 221 with gaps. In 1867 four more examples were built with the numbers 224 to 227. The diameters of the cylinders and the coupled wheels had each been increased by an inch.

Locomotive Magazine, October 1897

There were some differences in the locomotives between the individual production lots, which mainly affected the boiler. It was observed that the firebox gradually got larger in area, while the tube heating area decreased. Most engines were retired between 1893 and 1895, only number 225 survived until 1901.