Headlights, where carried, were mounted on both ends. Most were either side-tank or saddle-tank types, however in the usual departure from its neighbours' practice, the Great Western Railway used pannier tanks for shunting and branch line work, a practice which the Western Region of BR perpetuated until steam traction was phased out, with several examples joining a 9F as banking engines to assist locomotives on the notoriously arduous ascent of the Lickey Incline, replacing the LMS "Jinties" which had formerly carried out the task alongside "Big Emma". As diesel shunters began to appear in ever-increasing numbers, attempts were made by companies such as Sentinel to adapt the vertical boilers from their steam powered road vehicles for use in shunting locomotives, in order to compete with the newcomers. Although these were found to be equal in power and efficiency to most of the early diesel designs, their development came too late to have any real impact. Outwardly, they bear more resemblance to diesels than steam locomotives. A number have been preserved on heritage railways, although few of these are in working order, being designed very specifically for shunting work and lacking the necessary speed to travel any kind of distance. Small industrial shunters have sometimes been fireless locomotives and a few of these are still at work in Germany. Again, several have been preserved, but are mostly static displays, as heritage railways and museums lack the large source of high-pressure steam (such as a power station's boilers) needed to charge the locomotive's accumulator. British and European locomotives of this type tend to be much smaller than the common size in the United States. Current British shunters are 0-6-0 diesel-electrics, Class 08 and Class 09, of 350-400 horsepower. These were developed from similar locomotives supplied by the English Electric Company to the Big Four British railway companies in the 1930s and 1940s, e.g. those pioneered by the LMS. Similar locomotives were exported to the Netherlands (e.g. NS Class 600) and Australia (e.g. Victorian Railways F class (diesel)). The use of shunting locomotives saw a sharp decline in Britain in the latter half of the 20th century, largely due to the contraction of the network, increased competition from road traffic and widespread adoption of train-load freight, with fixed rakes of wagons moving mainly bulk products between rapid-loading facilities, as opposed to thousands of sidings and goods depots feeding trains of assorted wagons into the marshalling yards.