Head end power

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It has been suggested that Hotel Electric Power be merged into this article or section. (Discuss)
Head end power (HEP) or electric train supply (ETS) is a rail transport term for the electrical power distribution system on a passenger train. The power source, usually a locomotive at the front or ead of a train or a generator car, generates all the electricity used for lighting, electrical and other "hotel" needs. The maritime equivalent is Hotel Electric Power (HEP).
Contents
1 UK
1.1 Electric Train Heat (ETH) and Electric Train Supply (ETS)
2 USA
3 Engine
3.1 Separate engines
3.2 Locomotive prime mover
4 Electrical loading
5 Alternatives
6 References
7 External links
//
UK
Originally, trains hauled by a steam locomotive would be provided with a supply of steam from the locomotive's boiler for heating the carriages. When diesel locomotives and electric locomotives replaced steam, the steam heating was then supplied by a steam-heat boiler. This was oil-fired (in diesel locomotives) or heated by an electric element (in electric locomotives). Oil-fired steam-heat boilers were appallingly unreliable. They caused more locomotive failures on any class to which they were fitted than any other system or component of the locomotive, and this was a major incentive to adopt a more reliable method of carriage heating.
At this time, lighting was powered by batteries which were charged by a dynamo underneath each carriage when the train was in motion, and buffet cars would use bottled gas for cooking and water heating.
On modern Diesel multiple unit trains, such as the Virgin Trains Voyager, the engine mounted below each vehicle provides power for that vehicle.
Electric Train Heat (ETH) and Electric Train Supply (ETS)
Later diesels and electric locomotives were equipped with Electric Train Heating (ETH) apparatus, which supplied electrical power to the carriages to run electric heating elements installed alongside the steam-heat apparatus, which was retained for use with older locomotives. Later carriage designs abolished the steam-heat apparatus, and made use of the ETH supply not only for heating, but also to power lighting, ventilation, air conditioning, fans, sockets and kitchen equipment in the train. In recognition of this ETH was eventually renamed Electric Train Supply (ETS).
Each coach has an index relating to the maximum consumption of electricity that that coach could use. The sum of all the indices must not exceed the index of the locomotive. One "ETH index unit" equals 5kW; a locomotive with an ETH index of 95 can supply 475kW of electrical power to the train.
USA
During the age of steam, cars were heated by low pressure saturated steam supplied by the locomotive. Electricity for car lighting and ventilation was derived from batteries charged by axle-driven generators on each car or from engine-generator sets mounted under the carbody.
The first advance over this system was developed on the Boston and Maine Railroad, which had placed a number of steam locomotives and passenger cars into dedicated commuter service in Boston. It was discovered that due to the low average speeds and frequent stops characteristic of commuter operation, axle generators did not produce enough output to keep the batteries adequately charged, resulting frequent passenger complaints about lighting and ventilation failures. In response, the railroad fitted higher capacity generators to the locomotives assigned to pull these trains and arranged electrical connections to transmit the generators' output back to the cars. The cars still depended on steam from the locomotive for heating.
When Diesel locomotives were introduced to passenger service, they were equipped with steam generators to provide steam for car heating. However, the use of axle generators and batteries persisted for many years. This started to change in the late 1950s, during which time the Chicago and North Western Railway removed the steam generators from their EMD F7 and E8 locomotives in commuter service and installed Diesel generator sets. This was a natural evolution, as their commuter trains were already receiving low voltage, low amperage power from the locomotives to assist axle generators in maintaining battery charge. In some cases, commuter cars were equipped with propane engine-powered air conditioning. The resulting separate systems of lighting power, steam heat, and engine-driven air conditioning increased the maintenance workload, as well as parts proliferation, thus leading to the full-scale adoption of HEP, where a single power source would handle all these functions.
While commuter fleets were quickly converted to HEP, long distance trains continued to operate with steam heat and battery-powered electrical systems. This gradually changed following the transfer of intercity...(and so on) To get More information , you can visit some products about tooth brush sponge, slim solar charger, . The World Card Office Scanner products should be show more here!