One engine, the 2-2-2 "Agilis" was supplied in 1839 by Fenton, Murray and Jackson, who provided another "Rotherham", built under subcontract by Bingley and Company of Leeds. Another, the "Sheffield", said to be the first to have been built in that city, was provided in 1840 by Davy Brothers. This was a six-wheeled locomotive to design of a Mr. William Vickers. The 5 ft 6 inch drivers were connected to the other wheel by four-inch belts which provided traction on all wheels. It was later, it is believed, converted to a conventional pattern.