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DVD Electric Traction - Rail UK

Electric Traction - Railways UK

The main advantage of electric traction is a higher power to weight ratio than methods such as steam or diesel that generate power on board. Enabling faster acceleration and higher tractive effort on steep grades. On locomotives equipped with regenerative braking, descending steep grades requires little use of air brakes as the locomotive's traction motors become generators sending current back into the supply system and/or the on-board resistors converting excess energy to heat.

Other advantages include the lack of exhaust fumes at point of use, less noise and lower maintenance requirements of the traction units. Given sufficient traffic density, electric trains produce fewer carbon emissions than diesel trains, especially in countries where electricity comes primarily from non-fossil sources, such as Austria and France.
A fully electrified railway would have no need to switch between methods of traction thereby making operations more efficient. One country that approaches this ideal is Switzerland.
The main disadvantage is the capital cost of the electrification equipment, most significantly for long distance lines that do not generate heavy traffic. Suburban railways with closely-spaced stations and high traffic density are the most likely to be electrified, and main lines carrying heavy and frequent traffic are also electrified in many countries.

Most electrification systems use overhead wires, but third rail is an option up to about 1200 V. While use of a third rail does not require the use of DC, in practice all third-rail systems use DC because it can carry 41% more power than an AC system operating at the same peak voltage. Third rail is more compact than overhead wires and can be used in smaller-diameter tunnels, an important factor for subway systems.

As used in Southern England in the United Kingdom, third rail systems can be designed to use top contact, side contact, or bottom contact. Top contact is less safe, as the live rail is exposed to people treading on the rail unless an insulating hood is provided. Side and bottom contact third rail can easily have safety shields incorporated, carried by the rail itself. Uncovered top-contact third rails are vulnerable to disruption caused by ice, snow, and those fallen leaves!


Item Publisher/Supplier Item Name- Product Image Price
OV407D Online Video

25 Years of Southern Electrics Filmed In and around London

25 Years of Southern Electrics Filmed In and around London Length = 57 Minutes Format = DVD-R Copyright = A&J Video and Online Video By the end...
25 Years of Southern Electrics Filmed In and around London £16.00GBP

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OV435D Online Video

No Trolleys To Aquarium - Brightons Transport 1930-1960's

No Trolleys To Aquarium - Brightons Transport 1930-1960's Length = 86 Minutes Format = DVD-R Copyright = 2004 Online Video A look at Brighton's...
No Trolleys To Aquarium - Brightons Transport 1930-1960's £16.00GBP

... more info
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JK110D J & K Video

Southern Region Memories - British Rail Southern 1970's-80's

Southern Region Memories - British Rail Southern 1970's-80's Length = 72 Minutes Format = DVD-R Copyright = J&K Video Credits = John Laker, Bob...
Southern Region Memories - British Rail Southern 1970's-80's £17.95GBP  £16.95GBP

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OV365D Online Video

Vintage Southern Electric Trains

Vintage Southern Electric Trains Length = 70 Minutes Format = DVD-R Copyright = Online Video A selection of quality film from many sources,...
Vintage Southern Electric Trains £16.00GBP

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OV369D Online Video

Cliff Lifts of Great Britain

Cliff Lifts of Great Britain Length = 60+ Minutes Format = DVD R Copyright = 2008 Online Video A distinctly Victorian development - they first...
Cliff Lifts of Great Britain £16.00GBP

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OV364D Beulah

Fifties Underground - Aspects of Working

Fifties Underground - Aspects of Working on the London Underground  Length = 45 Minutes Format = DVD5 Copyright = 2005 Beulah - Transport for London...
Fifties Underground - Aspects of Working £16.95GBP

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OV369D Online Video

Piers & Pier Railways

Piers & Pier Railways Length = 88 Minutes Format = DVD R Copyright = 2008 Online Video This dvd takes a look at piers around the country and...
Piers & Pier Railways £16.00GBP

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