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Improving brake propagation in long freight trains

conference contribution
posted on 06.12.2017, 00:00 by Mitchell McclanachanMitchell Mcclanachan, B Payne
Brake propagation is slow for long freight trains that use a conventional air brake system. If the train is too long then the brake application will not propagate throughout the whole train. Brake propagation is one of the factors that limit the length of current heavy haul freight trains using a conventional air brake system. It is possible that a relatively simple modification to every wagon's brake valve could be done to ensure the brake signal is relayed throughout the train irrespective of the length of the train.The modification effectively increases the quick service volume or 'bulb' on Westinghouse style triple valves by connecting an additional volume and valve to the brake pipe. As each wagon's brakes apply, extra air will be taken from the brake pipe to fill the additional volume and thus ensuring the propagation of the brake signal to the rear of the train. The modification also has the advantage of reducing the time for the brakes to reach their final pressure, which reduces the train's stopping distance.A computer model of a complete train air brake system developed through the Rail CRC is used to discuss the advantages and disadvantages of the modification. Using air brake equipment at CQU, experimental tests have been conducted to determine the allowable size of the additional volume and show the stability of the modification.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Parent Title

Conference proceedings : Conference on railway engineering (CORE 2008), Perth, Western Australia, 7-10 September 2008.

Start Page

537

End Page

548

Number of Pages

12

Start Date

01/01/2008

ISBN-10

0858257831

Location

Perth, W.A.

Publisher

Railway Technical Society of Australasia

Place of Publication

Perth, WA.

Peer Reviewed

Yes

Open Access

No

Era Eligible

Yes

Name of Conference

Conference on Railway Engineering