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Serviceable 'F' type concrete sleepers

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Kerrie Pearson

16 December 2016, 10:50am

I am building a new track care maintenance depot in North London, we are installing serviceable 'F' type concrete sleepers. In the 4 foot on some of the sleepers there are two holes (the holes in the sleepers are approx 35mm in diameter) that run all the way through the sleeper, that appear to have been cast this way when manufactured. The holes look like they could have been to carry 3rd/4th rail, or maybe some signalling equipment.


I was after some information as to what they were used for, or if indeed they were cast this way - I do have a photo of one if someone wanted to contact me so I could send it them.


Many thanks Karl

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David Walters (Guest)

16 December 2016, 11:03am

I would suspect they are the one below for AWS.


Wayne (Guest)

16 December 2016, 2:41pm

I would agree. For S&T equipment.  

Mark Howells

03 January 2017, 6:53am

Most certainly for ATP/ATWS/TPWS or other S&T equipment. I have never seen any of the "F" series type sleepers pre drilled at the point of manufacture. The holes were normally site drilled after installation.

Peter Anderson (Guest)

20 January 2017, 10:47pm

With the advent of adjustable fixing brackets for AWS magnets, the need to manufacturer concrete sleepers with holes cast in for AWS equipment was negated. Thereafter, plain sleepers were provided and drilled on-site to suit.  I recall this was around 1988-1992

Tom Wilson

27 February 2017, 3:58pm

The F23A was supplied with a designated “A.W.S.” variant - with 1 11/32 inch (c. 35 mm) diameter holes to take A.W.S. inductors (see scanned copy of REPW/248C attached).

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