No. 6 Pilgrim of the Night is a battery-electric, articulated 0-4-4-0 locomotive which normally runs on the 7¼ inch gauge Stortford Railway. It was built in 1996, but its design is much older than that. The Woolwich Arsenal had an eighteen-inch gauge railway system which was operated largely by a fleet of ancient steam engines. A number of internal combustion locomotives were also used, however, and in 1954 Hunslet supplied Carnegie a massive articulated diesel. When the Arsenal system closed in 1966, Carnegie, along with other equipment including the steam engine Woolwich, was transferred to the Bicton Woodland Railway at Bicton Gardens near Budleigh Salterton in South Devon, where it worked a summer service for visitors until replacement by miniature equipment in 1999. At the time of writing Carnegie's present whereabouts is uncertain, but it is certain to be working again soon. The advantage of the articulated design of this locomotive is that it combines great power with the ability to negotiate very tight curves. These characteristics were just what was required by the Stortford Railway when No. 6 was built.
No 6 is not an exact copy of the Hunslet original; it has been shortened by one ventilator panel, and the design of its cab changed. In other respects, however, it is a 7¼ inch gauge version of the 18 inch gauge machine. Pilgrim of the Night was designed to take two one-horsepower motors, one on each bogie, but at present it is fitted with only one as this has proved more than able to handle the required traffic. The large bonnet carries the traction batteries, and may also house a battery for the lights and engine cooling fan. Control is through an electronic system provided by Parkside Railways of Nelson. An electronic brake is provided, and a mechanical brake acts on the front, non-driving, bogie wheels. No. 6 has travelled to a number of other railways, including Pentney Park, East Herts and Weston Park. She has generally acquitted herself well, although steep gradients and heavy loads flatten batteries very quickly, leading to talk of fitting a generator instead. So far, this has not been done