摘要:

The paper reviews present practice and the more recent developments in the design, grouping, and mounting of the control equipment and the auxiliary machines employed on multiple-unit electric trains. It covers only d. c. operation and the rheostatic accelerating-equipment usually employed on trains of this type. Electric braking is dealt with in another paper and is therefore excluded.

DOI:10.1049/pi-1a.1950.0032

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper refers briefly to the development of power-operated doors on multiple-unit electric stock from the system of manually-operated gates used on the early “tubes”.Systems of door control are discussed, with particularreference to protection against irregular operation, and particularsare given of the special types of door-control magnet valves developed by London Transport and adopted for certain BritishRailways electrification schemes. Compressed-air door-operating engines are similarly described, with a reference to methods of “controlling” the door movement and arrangements for the detraining of passengers in emergency. Some principles governing the design of door “proving” circuits are stated, with a mention of recent developments in the detection of door obstruction or faulty operation of the equipment.The concluding Sections refer to a new type of key-operated door controller, to experimental exterior door-control mechanism designed especially for operation by a guard located at the centre of a train, and statistical evidence of service reliability.

DOI:10.1049/pi-1a.1950.0033

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper deals with the characteristics which are expected of railway brake equipment. It outlines the growth of the electro-pneumatic braking system used in this country, and gives particulars of the latest practices, and of some recent developments.

DOI:10.1049/pi-1a.1950.0034

出版商:IEE    

年代:1950

数据来源: IET

摘要:

Part 1 is concerned with the general requirements of the electrical equipment for Diesel-electric rail vehicles.Part 2 describes the transmission equipment and the methods used to ensure that service requirements are met.Part 3 describes the electrical equipment of particular installations made by British manufacturers for shunting locomotives, rail-cars, and main-line locomotives.

DOI:10.1049/pi-1a.1950.0035

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper deals with electric braking systems on electrified railways where the braking effort is produced by traction motors acting as generators.Descriptions are given of the principal regenerative and rheostatic braking systems, together with their main characteristics.Considerations leading to the use and most suitable form of electric braking are discussed, and it will be observed that the ruling factors are economic ones.Locomotive-hauled trains and multiple-unit suburban motor-coach trains are treated separately as conditions are so radically different, and much greater space is devoted to locomotive-hauled trains as electric braking has been predominantly applied to them.The paper concludes by indicating how all the benefits of regenerative braking and efficient starting can be obtained with multiple-unit motor-coach trains without any addition to the motor-coach electrical equipment.The author's experience indicates that electric braking, particularly regenerative braking, is readily justified for locomotive-hauled mainline trains where there is sufficient length of route with gradients, but that only abnormal circumstances can justify its use with multiple-unit suburban motor-coaches.

DOI:10.1049/pi-1a.1950.0036

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper surveys the general position, distinguishing between multiple-unit and locomotive-hauled stock, each of which presents different problems. A brief historical treatment shows how standards of the past, especially for lighting, are not acceptable to-day. A low voltage supply from a motor-generator has superseded line-voltage series lighting. Developments are awaited in fluorescent lighting, the high cost of which cannot be justified at present. Emergency lighting is considered. The heating of locomotive-hauled stock by steam in a comprehensive main-line electrification in this country should be transitional only. Air-conditioning is not generally required, but conservation of heat by thermostatic control isdesirable. Some common defects are noted.

DOI:10.1049/pi-1a.1950.0037

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The paper gives various details of railway traction motors, indicating modern trends of design, especially as regards insulation, ventilation, stability, and the use of roller bearings for both armature and suspension. Gears for traction motors are also described, and modern practice indicated.

DOI:10.1049/pi-1a.1950.0040

出版商:IEE    

年代:1950

数据来源: IET

摘要:

Running attention is the routine maintenance carried out in order that rolling stock may operate in service with safety and reliability. The amount and nature of running attention given are determined in such a way as to secure the maximum degree of reliability consistent with a reasonable cost. The methods adopted on the London Transport railways are described in some detail by way of illustration, with particular reference to the conditions of operation on the system. The general principles underlying these methods are outlined, and examples quoted of how these principles have been applied on other systems. The influence of advances in design upon running attention is discussed, and the importance of close co-operation between those responsible for design and for running attention is emphasized.

DOI:10.1049/pi-1a.1950.0041

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The maintenance of electric rolling stock is an art rather than a science. Existing electric railway systems will have built up their maintenance technique from experience gained over many years, and for this reason the paper deals chiefly with matters likely to be helpful to the railway administration introducing electric traction for the first time.Many references have been made to the methods adopted by the London Transport Executive to deal with its large concentration of electric surface-line and tube rolling stock. Although the author recognizes that these methods may not be the most suitable for a smaller system or a more scattered one, the references may assist when deciding how best to meet the requirements of some new system. By contrast, reference has been made to experience gained on the Great Indian Peninsula Railway, an example of main-line and suburban electrification, which has also developed its own technique to meet the very different conditions imposed by a different line voltage, different type of train service and a less concentrated system.The paper discusses the influence of design on maintenance and the maintenance organization; it outlines much of the work involved and the distribution of this work between the various maintenance establishments. It deals with the layout of these establishments and some of the essential plant and equipment required. Notes on cost, lubrication and essential forms and records are included, and the paper closes with some remarks on management, staff training and safety precautions.

DOI:10.1049/pi-1a.1950.0042

出版商:IEE    

年代:1950

数据来源: IET

摘要:

The question of maintenance is approached from the point of view trying to determine what are the basic principles which should govern the methods and standards of maintenance.It is evident that if sufficient care has been given to the design, then only those parts of the equipment which are subjected to fairly heavy stresses should require examination. Most of the main wearing parts can be changed or reconditioned at the running sheds, and it should be possible to maintain the locomotive efficiently without major works overhauls, except at long intervals.The need to bring the locomotive into the works should be determined by the necessity to give attention to those parts which cannot be dealt with at the sheds, such as crankshaft grinding, which should only occur at ten-yearly intervals.It is stressed that maintenance cannot be considered as an isolated problem, but it is closely associated with design and operating conditions. There should be an organization whereby all these aspects are co-ordinated, in order that development may proceed along the right lines.Reference is made to the maintenance of main-line Diesel locomotives, but experience here is not extensive.

DOI:10.1049/pi-1a.1950.0043

出版商:IEE    

年代:1950

数据来源: IET