Welcome to the 

Owners and operators of two CLASS 52 DIESEL HYDRAULIC LOCOMOTIVES on the 
Severn Valley Railway.

Welcome to our locomotives

All Western Class 52 locomotives were fitted with two engines driving two transmissions. The equipment associated with these was duplicated in each end. The basic workings are shown as follows:

When running, the Maybach MD655 engine (1) rotates the engine to transmission cardan shaft coupled to the transmission (2). Using internal gears, two smaller cardan shafts mounted on top of the transmission rotate the dynostarter and hydrostatic oil pump (these are not shown) for the cooling fans (3). The dynostarter provides 110 volts for the electrical systems operating on the locomotive and acts as the starter motor for the diesel engine (1). The hydrostatic oil pump (not shown) works constantly and a small electrically operated valve diverts oil to the fans (3) to turn them as required.

When the driver selects "forward" (or "reverse") direction and then "notch one" on the power controller, the transmission (2) convertor 1st stage (gear) fills with oil and the diesel engine now begins to rotate this oil, rather like a ships propeller in water. Face to face with this "propeller" is another similar "propeller" which begins to rotate too and this is coupled to another cardan shaft leading to the bogie mounted intermediate gearbox (4). In this gearbox, a combination of bevel and wheel gears transmit the drive downwards. From there cardan shafts (5) transmit the drive to the axle mounted final drive gearboxes (6). The locomotive will begin to move foward as soon as the brakes have been released.

As more power is applied by the driver (up to notch 9) on the power controller, the locomotive moves forward gaining speed and the converters within the transmission (2) automatically change (1st to 2nd; 2nd to 3rd), each convertor decreasing in physical size until the 3rd convertor is used. This, the smallest of the three converters, then drives the train forward in the speed range between 63 and 90 mph.

The two locomotives owned by the Western Locomotive Association Limited are based on the Severn Valley Railway, which operates over 16 miles of track between Bridgnorth and Kidderminster. These are “Western” class 52 diesel hydraulics, namely: D1013 Western Ranger (painted blue) or D1062 Western Courier (painted maroon). Both locomotives have long since been retired from service on British Railways, where the locomotives of this type ran from 1962 to 1977.

The Western class are considered to be a historically and technically significant design as they replaced the famous King and Castle class of steam locomotives on the former Great Western Railway in the 1960’s before being replaced in turn by the Inter City 125 High Speed Train. Most of the 74 locomotives were broken up for scrap, although 7 survived; Western Ranger and Western Courier are now kept in full working order on the Severn Valley Railway.

The German Western!

LOCOMOTIVE V300 001 (230 001-0)
By Doug Tompkins

The introduction of Deutsche Bundesbahn’s (DB) class V200 diesel-hydraulic locomotives was the subject of great interest to foreign railway administrations when first exhibited at the German Transport Exhibition in München in 1953 and this led to DB and the locomotive builders Krauss-Maffei sending locomotive V200 005 on a series of demonstration runs to Turkey. On the return leg various tests were also undertaken in Greece and from 12-15 May 1955 in Yugoslavia. The Yugoslav railway administration was very impressed with the locomotive’s performance and this led to them placing an order for three V200 type locomotives to haul official trains for President Tito on the Yugoslavian Railways (JZ) system.

In original form however, the V200 had an axle load of 20t, which was too heavy for Yugoslavian lines and so a longer six-axle design had to be constructed instead. The order was placed with Krauss-Maffei in München in 1956 and the first of the new JZ class D66 locomotives was shown at the Hannover Industrial Fair in 1957. The trials with these three locomotives were so successful that the builders decided to construct a fourth example entirely funded by themselves for evaluation in Germany. On 15 August 1957 the locomotive, classified ML2200 C-C, was placed into service at Bw Frankfurt-Griesheim depot and in the first month of operation covered more than 20,000 kilometres. From 19 September to 3 October 1957 a period of extensive test runs took place on the Semmering line in Austria. Following further trials on the Black Forest lines from Bw Villingen depot however, it was realised that for the haulage of the heavier trains the existing power units were inadequate. So, between 17 November 1957 and 22 May 1958, two new and more powerful engines were installed at Krauss-Maffei and the locomotive was renumbered ML 3000 C-C.

As ML 3000 C-C the locomotive returned to DB metals in May 1958 and successfully underwent further trials in the Black Forest and on the ÖBB’s Semmering line. Her performance in use from Bw Villingen showed that the locomotive, compared to a V200/0, could now handle double the trainload in half the journey time. From 3 October 1958 the locomotive returned to Bw Frankfurt-Griesheim until moving later to Bw Hamm/Westf. On 14 April 1964 the locomotive was purchased by DB and renumbered V300 001; officially entering DB service following an overhaul at AW Nürnberg on 4 August 1965.

During her ten-year spell at Hamm/Westf depot she was initially deployed on heavy express passenger services between Hamm and Köln as well as on the line to the East German border station at Helmstedt. On 1 January 1968 the locomotive was renumbered 230 001-0 in keeping with DB’s new computer numbering scheme and one year later she was reallocated to Bw Lübeck, finally moving to Bw Hamburg-Altona on 7 August 1970. For almost five years she was used to haul train numbers D532/533 on the ‘Marschbahn’ to Westerland/Sylt until replacement by newly delivered class 218s. Despite her excellent performance however, she remained a one-off type and on 26 August 1975 she was withdrawn from service and put into store at AW Nürnberg. In September 1977 she was despatched in a freight train to Udine in Italy but her purchase to a track maintenance company there did not proceed and so the locomotive returned to Germany. In 1979 she arrived at the firm Layritz in Penzberg, Bavaria and one year later she was cut up at Feldkirchen, near München.

Technical Details

As mentioned above, the construction of this locomotive in original guise as ML2200 C-C was based on that of the V200/0 with two Maybach MD650 engines each with an output of 810kW (1,100hp) and Maybach-Mekydro type K104 transmissions. Due to her six-axle format the length over buffers was 20,270 mm against 18,470mm on a series production V200/0. During her period in the workshops at Krauss-Maffei in 1957/58 the locomotive was equipped with two new more powerful engines of Maybach type MD655 which, through turbo-charging and intercooling, each gave an output of 1,100kW (1,500hp). In order to cope with this increased output the transmissions also had to be changed and so newly developed Maybach-Mekydro transmissions of type K184U were installed together with a new 15-stage Brown Boveri control system in place of the existing 6-stage unit. Further technical details are given below:



The livery carried by the locomotive when numbered ML2200 C-C was blue and white (Bavarian State colours) with dark grey frame and pale grey bogies. On each nose end access door was positioned a cast works plate and the letters KRAUSS-MAFFEI AG were written in chrome along the bodysides. On re-equipping with more powerful engines and renumbering to ML3000 C-C she was repainted in a bright red and off-white livery and two new, larger pattern, works plates were applied to the nose end access doors. The frame was repainted in pale grey. In DB service the locomotive received the standard crimson red (RAL 3002) livery as per the V200 class with the characteristic ‘V’ formation on the front ends. The builders’ plates were repositioned to the bodysides below the DB emblem.


To my knowledge the only model available of this unique locomotive is an HO example from the Italian company Lima. The model has been in existence for a number of years now and it has been offered in all three livery variations and in DB colours as both V300 001 and 230 001-0.


Eisenbahn Fahrzeug-Katalog Band 7: Dieseltriebfahrzeuge.
Gera Nova GmbH, München.
ISSN 0949-197X/B12126F

Album der DB-Lokomotiven-Deutsche Fahrzeug-Entwicklungen 1949-1993.
Andreas Knipping,
Gera Mond Verlag GmbH, München, 1999
ISBN 3-932785-90-9

Die Diesellokomotiven bei der DB, Geschichte-Entwicklungen-Einsatz.
K.Matthias Maier,
Franckh’sche Verlagshandlung, Stuttgart, 1988.
ISBN 3-440- 0587-0

How does a Western Diesel Locomotive work?

A diesel engine works by internal combustion. Fuel is sprayed into the cylinders with air and compressed by a piston. If you compress a gas, it produces heat. In a diesel engine, this heat is sufficient to ignite the fuel, which explodes. Unlike a petrol engine, there is no sparking plug. This explosion produces an expansion of gases within the cylinder, which forces the piston down. The piston is linked to a crankshaft, which converts the up, and down motion of the piston into a turning motion known as torque.

The Western locomotive has two 65 litre Maybach MD 655 diesel engines each driving a Voith hydraulic transmission, which turn the wheels via a gearbox. The cylinders are arranged in a V formation driving a common crankshaft. The Maybach diesel engine has 12 cylinders and produces 1380 hp at 1,500 rpm. Maybach diesel engines were also used in marine installations such as motor torpedo boats and fishing boats.

The Maybach diesel engine operates on a four-stroke cycle: that is two up strokes and two down strokes. An inlet valve and an outlet valve are operated from a camshaft and control the air into the cylinder and the exhaust gas out.

The sequence is as follows:-

First stroke-Induction. This begins as the piston commences the down stroke with the inlet valve open. As the piston commences downward, it draws air past the open inlet valve into the cylinder. The exhaust valve is closed at this stage.

Second stroke-Compression. When the piston has completed the down stroke, the inlet valve closes, and as the exhaust valve is already closed, the air contained in the cylinder is trapped. The revolving crankshaft pushes the piston up and as it rises, the air trapped in the cylinder is compressed up into the combustion chamber. As the air is compressed, it becomes extremely hot.

Third stroke-Power. With the valves still closed, fuel oil is sprayed through an injector into the top of the cylinder at the point of greatest compression and heat. The heat from the compressed air causes the fine oil to ignite and greatly expand in volume. This forces the piston down the cylinder.

Fourth stroke-Exhaust. At the end of the power stroke, the exhaust valve opens and during the following up-stroke of the piston the waste gases are pushed past the valve and out of the engine.


A turbo-charger is used in order to obtain the maximum power from the engine. This is a device, which contains a turbine that sucks in air and forces it into the inlet valve of the engine. The turbo-charger is driven from a turbine powered by the exhaust gases of the engine.

To keep the engines and turbo-chargers cool, the locomotive has large fans mounted in the roof. These draw air through the louvres in the body-side and through the radiators mounted above the engines. The turning action of a diesel engine cannot be linked directly to the wheel. It has to be controlled so that the locomotive can start from rest with a train and cope with different gradients and loads. This is achieved on a Western locomotive using a hydraulic transmission. Most locomotives nowadays use diesel electric transmission where the diesel engine turns a generator and the power produced drives electric motors, which turn the wheels.

In a diesel hydraulic locomotive, there is a torque converter, which is rather like a hydraulic pump revolving inside a housing filled with oil. It has three main parts, of which two rotate and one is fixed. Each part consists of a ring with specially shaped blades. The blades are curved to control the direction of the flow of oil. The three parts of a torque converter are the impeller (a centrifugal pump), the turbine wheel (or driven wheel) and the fixed guide wheel (or reaction wheel). The diesel engine drives the impeller and its power is passed on to the oil in the converter. The oil is impelled by the impeller blades onto the turbine wheel blades, causing the turbine wheel to rotate.


The above photograph shows the relatively small and compact size of a hydraulic transmission.

The turbine wheel is connected by a shaft to the locomotive wheels. When the turbine wheel rotates, the locomotive wheels rotate. The oil is returned by the turbine wheels to the impeller, passing through the blades of the fixed guide wheel which adjust the angle of the flow of oil to the impeller. The oil is pumped around the circuit repeatedly.

The advantage of a diesel hydraulic system was its lightweight construction. Also, the torque converter is so designed so that the lower the speed, the greater the pulling power. It also provides a shock free drive between the engine and locomotive wheels over the whole range of engine power.

Building the Westerns

The Westerns were built at Swindon Works in Wiltshire and Crewe Works in Cheshire. A total of 74 were produced between 1961 and 1964, 35 at Swindon and 39 at Crewe. The Westerns employed a stressed skin body shell rather than the heavy frame that had been used previously on earlier diesel locomotives. This comprised of substantial two steel tubes running from end to end of the locomotive. A steel honeycomb was built up from these tubes to create a lightweight yet rigid structure very similar to a motorcar chassis. This technique had been pioneered by the American civil engineer Stepan Timoshenko and is based upon the premise that thin metal sheet, if folded and shaped can be made to serve a load bearing function.

The Westerns were essentially a British development of a prototype locomotive built by Krauss-Maffei in 1957. This locomotive, known as ML3000 was an enlarged version of the successful V200 design but with six wheel bogies giving greater traction and braking effort. The design had to be compressed to fit within the British loading gauge and 74 locomotives were ordered in October 1959. The unit cost of each locomotive was given as £115,500.00. Remarkably no prototype was developed or evaluated. The class was ordered before the detailed design had been finalised.

Structurally, the Westerns were very similar to the earlier Warship design. They were however proportionately longer and heavier. The first of the class D1000 Western Enterprise was delivered in December 1961 and the last arrived in April 1964. It was no coincidence that the first of the celebrated Great Western King class locomotives was withdrawn in February 1962 with the class being completely withdrawn by the end of the year. The Westerns were initially allocated to Laira Depot in Plymouth, Canton Depot in Cardiff and Old Oak Common Depot in London. Eventually the whole fleet was based at Laira.

What did the Westerns do?

The Westerns were “mixed traffic” locomotives, that is they worked on both passenger and freight trains. A Western could for instance, haul the Cornish Riviera express passenger train on one day and then a 600 tonne stone train the following day. This is unusual today, when modern locomotives are specifically designed for either one role or the other.

In their early days, Westerns worked trains from London Paddington through to Birmingham Snow Hill, Wolverhampton Low Level, Shrewsbury, Chester and Birkenhead. These duties ceased in the late 1960s with the closure of Birmingham Snow Hill, although in later years they regularly worked to Birmingham New Street via Oxford and Reading. Westerns regularly worked on passenger services from London Paddington to and from Bristol, Cardiff, Swansea, Plymouth and Penzance. It was relatively rare for them to go further afield. Freight duties included working stone trains out of Merehead Quarry in Somerset, China Clay trains to and from Cornwall and Milk trains from the West Country to London.

The reign of the Westerns came to an end with the completion of the electrification of the north part of the West Coast main line between Crewe and Glasgow. This released the fleet of fifty class 50 diesel electric locomotives, which had worked those services. The plan was to reallocate the Class 50 fleet to the Western Region in 1974 enabling the Western fleet to be made redundant; to be withdrawn from service and scrapped. The first Westerns were withdrawn in 1973 and it was planned to complete the process by 1975. The Warship fleet had been withdrawn by the end of 1972 and the Hymek fleet had been withdrawn by early 1975.

The class 50 fleet proved to be notoriously unreliable in service. They were often known as 50/50’s because they previously worked in pairs on occasions or because it was perceived that you had a 50% chance of getting to your destination without a failure! Whilst they were technologically advanced locomotives, the Western Region were unfamiliar with their foibles and at one point half the fleet were out of traffic waiting for repairs. This left the Western Region with a locomotive shortage and so the Westerns soldiered on.

In October 1976, the Inter City 125 High Speed Train (HST) entered service and subsequently formed the backbone of Western Region and later First Great Western express passenger services. It is interesting to note that the HST locomotives are now being re-engined with MTU power units. MTU are the successors to Maybach and the new Adelante class 180 of diesel multiple units have hydraulic transmissions.

Why preserve a Western?

The Western Locomotive Association was founded in1974, one year after the first Western had been withdrawn. Railway preservation was in its infancy and most enthusiasts were preoccupied with the rescuing of steam locomotives from Barry Scrapyard in South Wales. The suggestion that a diesel locomotive should be preserved was greeted in some quarters with incredulity and derision. The Westerns were regarded amongst enthusiasts and railwaymen as being different from other diesel locomotives and after a successful public appeal, D1062 was successfully purchased for preservation in 1976. Richard Holdsworth initially purchased D1013 in 1977 and they were originally based on the Paignton and Dartmouth Railway at Kingswear. Although this was a route which Westerns had worked trains on, Kingswear was a residential area where the locomotives were exposed to sea air and so it was decided to move both locomotives to the Severn Valley Railway in 1978.

The reception given to the Westerns was mixed. Some ‘die-hard’ steam enthusiasts were openly hostile. However, the Westerns soon proved themselves to be popular and useful locomotives and one or other of them has worked every season since arriving. D1062 was the first preserved Western to travel under its own power on the mainline when it took part in the Liverpool and Manchester Railway celebrations in 1980 at Rainhill. D1013 has appeared in a number of television programmes and commercials including ‘L for Lester’ and advertisements for crunchy nut cornflakes and British Gas!

Both of our locomotives have been modelled by Hornby in OO gauge and Graham Farish in N gauge and D1013 features in the Severn Valley Railway add on to the Microsoft Train Simulator computer programme.

The Western Locomotive Association has successfully operated two of these iconic locomotives for thirty years, twice as long as they were operated by British Railways.
Five other Westerns have been preserved. These are:-

D1010 Western Campaigner preserved by the Diesel and Electric Group on the West Somerset Railway
D1015 Western Champion preserved by the Diesel Traction Group.
D1023 Western Fusilier preserved by the National Railway Museum at York
D1041 Western Prince preserved at the East Lancashire Railway
D1048 Western Lady preserved at the Midland Railway Centre in Derbyshire.

The Western Locomotive Association is committed to the preservation of D1013 and D1062 as working locomotives on the Severn Valley Railway, with mainline running for D1062 kept under active consideration.

Many people enjoy the aesthetically pleasing shape of the Western, which never appears to be dated and the art of good design; the power of the Western is something to be experienced especially when driving with 2,700 bhp and 76,000 lbs of tractive effort available – twice the power of a Castle Class steam engine and then there is the sound – two throaty Maybach V12 engines that can be heard for miles on full power, not dissimilar to the glorious sound of a Spitfire or Lancaster Bomber.

With your help, we certainly intend to be supplying ‘Maybach Music’ for many years to come.