Sentinel Waggon Works
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Sentinel Waggon Works was a British company based in Shrewsbury that made steam powered lorries ("road locomotives"), railway locomotives and later diesel engined lorries and locomotives.
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[edit] History
They were originally formed in 1906 as Alley & MacLellan in Glasgow but moved due to industrial unrest.
[edit] Relation with Thomas Hill's
Thomas Hill's had a close relationship with Sentinel. In 1946 an agency agreement was signed between the two companies for repair and maintenance of diesel vehicles. In 1947 Sentinel offered to extend the agreement for diesel vehicles to include the steam locomotives and an agency was accepted by Thomas Hill for sales and servicing. In 1963 Thomas Hill's decided to renew the loco agreement and relinquish the diesel vehicle agency, concentrating all efforts on the steam locomotive work. With the acquisition of Sentinel by Rolls-Royce this relationship was to become even closer.
[edit] Rolls-Royce and the end of Steam
The business and factory of Sentinel (Shrewsbury) Ltd was acquired by Rolls-Royce in 1956 for the manufacture of the Rolls-Royce diesel engines.
- Rolls-Royce agree to build diesel locomotives
Despite the various interesting developments, Rolls Royce did not consider railway locomotives to be part of their core business. They had agreed to complete all steam locos on order, and four steam receiver locos ordered by Dorman Long in 1956, but only after much consideration did Rolls royce finally agree at the end of 1957 to design and build a diesel locomotive of similar weight and power to the 200 hp steam loco that had sold so well. Thomas Hill's would assist in the design and development of these diesel machines and would be the Sole distributor.
- Last steam locomotives
In 1958 the last two Sentinel steam locos were delivered marking the end of an era. Two of the newly developed steam receiver locos were delivered and proved very satisfactory in service, but Dorman Long were not happy. There had been a change of heart among their engineers as well as a change of circumstances, and they were now favouring diesel locomotives. The last two steam receiver locos were built but never delivered and ultimately all four were converted to diesel hydraulic.
- Diesel Production commences
The prototype Sentinel diesel loco was now in build and was to commence trials on the S & M Railway early 1959. The prototype Sentinel operating on the S & M met with approval and enthusiasm of the Company's prospective customers and before the end of the year 17 locomotives had been sold and delivered. Production was already geared up to complete four locomotives a month.
By 1963 four Sentinel models were being produced, commencing with the 34 ton chain drive 0-4-0 powered by the Rolls-Royce C6SFL six cylinder engine at 225 bhp. This was followed within a year by a 48 ton 0-6-0 rod coupled machine, fitted with a Rolls-Royce C8SFL eight cylinder engine at 325 bhp.
Two locomotives, an 0-4-0 and an 0-6-0 were constantly employed on demonstration particularly in steel works. The duties were arduous and the Sentinels were able to prove their suitability for such work. Heavier, and more powerful locos were called for, particularly by the steel industry and before the end of 1963 a 75 ton 0-8-0 powered by 2 x C8SFL engines and a 40 ton 0-4-0 fitted with a C8SFL engine had been added to the range.
- Sentinel Steelman
A shaft drive 600 hp 0-6-0 machine was now being developed at Shrewsbury to use the new DV8T engine. Considerable interest in this loco was expressed by Stewart and Lloyds mineral division at Corby who were operating more than 20 steam locos, mainly of the Austerity type. This new locomotive Steelman was eventually delivered to Corby late 1967, about two years overdue. The prototype locomotive proved satisfactory and three further machines were ordered by Stewart and Lloyds plus one by Richard Thomas and Baldwins, Scunthorpe. With Stewart and Lloyds programme to replace more than 20 steam locos over the next few years the future for Steelman looked good.
Unfortunately for the Company and Rolls-Royce, British Railways, seeing a potential for their Swindon built class 14 Diesel hydraulic locomotives made Stewart and Lloyds an offer of 26 locomotives around three years old at a fraction of their original cost. This locomotive had proved rather a white elephant to B.R. but powered by a 650 hp Paxman, Voith Transmission, a rod coupled 0-6-0 capable of doing the work required, it was an offer which they could hardly refuse. New locomotive sales were declining anyway, and the release of such locos onto the industrial market at such prices was disastrous, and regrettably no further "Steelman" locos were built at Shrewsbury.
This was not to be the end of the Steelman. Some 12 years later ICI Billingham had a requirement for two heavy locomotives to replace their ageing Yorkshire Janus locomotives. Their stated wish was to buy the best and most up to date equipment available and in their efforts to achieve this aim, their engineers visited many industrial sites, and steelworks in particular. Their requirements were discussed with all UK locomotive manufacturers, and the final outcome of their investigations was an order placed to build an updated version of the "Sentinel Steelman locomotive". This order was subsequently increased to two machines which were delivered toward the end of 1981.
UK sales of Sentinel locos were now less than 10 per year, their only overseas success had been to licence the build of 36 0-6-0 locomotives for the railways in Portugal in 1965/6.
[edit] Road Vehicles
[edit] Steam Lorries
- Alley & MacLellan 5 ton vertical boiler wagon (1906)
- Super Sentinel (1923)
- Sentinel DG4 (1926)
- Sentinel DG6
- Sentinel DG8 (1929)
- Sentinel S4 (1930)
- Sentinel S6
- Sentinel S8
[edit] Diesel Lorries
- Sentinel DV44 (1948)
- Sentinel DV46
- Sentinel DV66 (1952)
- Sentinel aircraft tug
[edit] Railway Vehicles
The locomotives and railcars (with a few exceptions) used the standard Steam Lorry boilers and engine units.
[edit] BE Class
Balanced Engine
[edit] CE Class
Centre Engine
[edit] DE Class
Double Engine
[edit] 100 hp Steam Locomotives
[edit] 200 hp Steam Locomotives
[edit] Railcars
Sentinel provided the sole RM class Sentinel-Cammell steam railcar operated by the New Zealand Railways Department.
[edit] Specials
[edit] The Doble Shunter
[edit] The Double Locomotive
A special locomotive was produced at Sentinel, for Dorman Long and named "Princess". It consisted of 2 x 0-6-0 chassis coupled together to articulate. One unit carried the cab, a 5 drum oil fired Woolnough boiler and two 100 hp engines. The other unit housed the water and fuel tanks and also two more 100 hp engines providing a total of 400 hp. It was considered a magnificent machine by the staff but unfortunately was the only one of its kind ever built.
[edit] The Gyro Locomotive
Another special was the Gyro Locomotive. Based on a 200 hp 4 wheeled 0-4-0 frame fitted with two "gyro units" (Flywheels) made by Oerlikon of Switzerland. The gyros were principally a 3 ton horizontal flywheel enclosed vessel filled with low pressure hydrogen. A vertically mounted electric motor/generator was directly coupled to the flywheel shaft. The motor took its power from an overhead supply via a type of pantograph arm raised or lowered by the driver. Power could only be taken whilst the loco was stationary. When the gyros had reached the required speed, the driver would lower the pantograph, switch the motor to generation and controlled the locomotive in a similar way to a diesel electric loco. Charging posts had to be strategically placed around the site.
This machine was specially built for the National Coal Board (NCB) at Seaton Delaval. It operated very satisfactorily but was eventually taken out of service because of site development and its restricted field of operation. In April 1965 it was converted for the NCB to a diesel hydraulic machine.
[edit] The Receiver Locomotives
The Receiver Locomotives were another special type built just for Dorman Long and were based on the idea of a Fireless locomotive.
[edit] Steam locomotives used by UK Main Line Companies
- LNER Class Y1
- LNER Class Y3
- S&DJR Sentinels
- LMS Sentinels 7160-3
- LMS Sentinel 7164
- LMS Sentinel 7192
