4wDM Sentinel shunter Profile and Models

4wDM Sentinel shunter

10119 at Long Marston in September 2010. ©Hugh Llewelyn

In 1959 Sentinel produced a prototype diesel shunter which was operated on the military controlled Shropshire & Montgomeryshire Railway. In total 17 were produced and operated quite successfully during that year. 1963 saw the introduction of the 34 ton chain drive 4 wheel Rolls-Royce diesel powered Sentinel shunter rated at 233 bhp which was later uprated to 255bhp. As time progressed the design was modified with all manner of variations, including 6 and 8 wheel coupled locomotives which found service in collieries, dockyards, quarries and foundries, with others being exported and operated on Portuguese Railways. Over the years, as these locomotives were retired, many found their way on to preserved railways where they continue to provide stalwart service. 

(Information provided by Hornby)

Type of Locomotive



Sentinel Waggon Works

Build Date


Wheel Configuration


Current Operators

Many industrial & railways

Main Duties


In Service Until