Shortest section of single track

Discussion in 'Infrastructure & Stations' started by Greetlander, 9 Oct 2019.

  1. Greetlander

    Greetlander Member

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    I took this screenshot from the excellent cabview video from Don Coffey (and if you're on here Sir, I apologise for the theft and salute your excellent films).

    It's the "single lead junction" across Scarborough Bridge at York. It has me wondering if the section between the points qualifies as a single line, and if so, is there a shorter section anywhere else?
     

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  3. transmanche

    transmanche Established Member

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  4. Bletchleyite

    Bletchleyite Veteran Member

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    I was going to say Ribblehead Viaduct, but I think yours wins :)
     
  5. dscsys

    dscsys New Member

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    Shipley platform 5?
     
  6. 30907

    30907 Established Member

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    ...is quite a bit longer, but you remind me that for a few years 3 and 4 shared a short section of single track over Low Well bridge. But then we are getting into single-lead junctions which are IMO not quite what the OP was referring to - York was just to save money.

    BTW Reading 4b was an add-on to the original 1965 4a.
     
  7. MarkyT

    MarkyT Established Member

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    Vastern Road bridge, at the east end of Reading station, was rebuilt in the 1960s or 70s after the old separate Southern station had closed. The Southern service was so sparse in those days that BR thought they could get away with a single replacement platform at General originally, roughly on the alignment of the former parcels bay and down siding, so the new bridge was built to accommodate just that one line next to the GWML Down Main and a narrow public footpath alongside. It didn't take long to realise a single Southern platform couldn't cope reliably and was a big mistake, so a second was added pretty quickly. Placing the new turnout just west of the bridge avoided widening it at that time and accommodated the then standard 8-car maximum trains. When plans were formulated to use 10+ car trains on the South Western, a reconstruction of the bridge would have been neccessary even if the single lead throat configuration had been retained, but once the pointwork was to the east of the bridge, a more conventional double track throat arrangement was possible to arrange, which is what is there today feeding the three 12-car terminal platforms.
     
  8. BucksBones

    BucksBones Member

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    Was about to post Dore & Totley - then looked more closely at the picture in the OP! I can’t see how it’s even physically possible to beat that - what is it, 2 foot?!
     
  9. najaB

    najaB Veteran Member

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    Why is that even a thing? Was the bridge weak on one side?
     
  10. SWTCommuter

    SWTCommuter Member

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    I think it's an economical form of crossover allowing Scarborough line trains access to/from platforms 4 and 5
     
  11. Dunfanaghy Rd

    Dunfanaghy Rd Member

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    Does it qualify as a single line if it is within station limits? (Or however it is called in the era of IECs and ROCs.)
    Pat
     
  12. james60059

    james60059 Member

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    He's definitely one of the best for cab views if not THE best. :D
     
  13. ijmad

    ijmad Established Member

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    Wimbledon Platform 9. Not the shortest but pretty short.
     
  14. Ploughman

    Ploughman Established Member

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    Guiseley used to have a similar layout to that at York with 2 turnouts.
    But that is where 2 single lines merged into double.
     
  15. brad465

    brad465 Member

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    The Medway Valley line divergence at Paddock wood is pretty short, depending on how you view the mainline platform. It diverges from platform 2, the the bay platform line connects onto the single line, before the line almost immediately becomes 2 track beyond that junction, if that makes sense.
     
  16. LNW-GW Joint

    LNW-GW Joint Veteran Member

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    There's a similar layout at Golborne Jn turning off the WCML towards the Chat Moss route.
    The quad WCML becomes double and then has a single turnout for the junction towards Parkside; it then splits immediately for Lowton Jn where the Liverpool route curve diverges from the Manchester one.
    The layout dates from when there was next to no passenger traffic between the two main lines, but it has carried a heavy load over the past few years while electrification has been in progress on the Bolton line.
     
  17. Sean Emmett

    Sean Emmett Member

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    Weymouth must be a contender - the two running lines come together for a brief single line section before fanning out to the stub for the quay branch and the 3 platforns
     
  18. Ianno87

    Ianno87 Established Member

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    Trowse Swing Bridge.

    West end of Dinting triangle.
     
  19. westcoaster

    westcoaster Established Member

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    Also I'd say that is not a single line it's just two sets of points facing away from each other.
     
  20. ComUtoR

    ComUtoR Established Member

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    What is considered a 'single line' is a 'reversible line' included ?

    My vote would be for Hawkwood Junction
     
  21. big all

    big all On Moderation

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    They are single lead junctions, mainly to save cost and/or fit within the available space.

    You need two points for full access, rather than two crossovers and a lot of space.

    Or you could use a diamond crossing in the same space
     
    Last edited by a moderator: 10 Oct 2019
  22. BS56

    BS56 Member

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    Of course there is Ware station on the Hertford East branch but this is just a bit longer then the platform and is well within station limits
     
  23. 507 001

    507 001 Established Member

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    There’s a fairly short stretch on the approach to Llandudno.
     
  24. swt_passenger

    swt_passenger Veteran Member

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    I think “across” there meant “the other side of”. The bridge itself does have two tracks.
     
    Last edited: 10 Oct 2019
  25. CEN60

    CEN60 Member

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    For the record - back to back half connections as per the photo in the 1st post if installed new would have a "single" line length of 2x3.070m = 6.14m (if standard fronts on Vertical S&C) - however in the past the fronts used to be less (1.7ish m I think) - so the "single line" could be 3.4m "ish" - S&C does get "butchered" on site thru' the years - S&C this close does & can cause problems - buffer lock for one, the current NR Track design standard indicates "ideal" lengths between S&C - however there are many locations similar to the above on the network.
     
    Last edited: 11 Oct 2019 at 10:04
  26. godfreycomplex

    godfreycomplex Member

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    Very small single lead going into the Up & Down Kew Branch at Old Kew Junction (between Brentford & Kew Bridge for the unitiated)
     
  27. deltic08

    deltic08 On Moderation

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    A single line is one connecting two double lines however short and that is what this is. A single line connecting to only one double line is called a siding.
     
  28. Tomnick

    Tomnick Established Member

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    No it isn’t - a siding isn’t a running line, and dead-end single lines (e.g. Colne or Windermere) are running lines, not sidings.

    I’d suggest that a physical single line ought to be at least one signal section in each direction to qualify - you certainly wouldn’t consider those short bits such as the OP’s example in York as single lines in the context of the signalling regs!
     
  29. 6026KingJohn

    6026KingJohn Member

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    What about Criananlarich? See photo, one set of points for the split to either side of the platform and one for a main junction between the Oban and Fort William lines. Northbound trains split and then depart for separate destinations, no problem you can visually see when the points have been cleared. Southbound, however, with joining trains where is the single line token to? As an example, from RTT. 1Y44 from Fort William leaves Upper Tyndrum at 1319 and arrives at Crianlarich at 1327. meanwhile 1Y24 from Oban leaves Tyndrum Lower at 1320 while the Fort William train is in section, and arrives at Crianlarich at 1331. Both trains continuing at 1337 as 1Y44.
    Now, do BOTH trains have a token to Crianlarich or is it to just before the points, making the bit between the two sets of points a separate single track?
    Perhaps one of the more knowledgeable signallers could enlighten me.
     

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  30. ComUtoR

    ComUtoR Established Member

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    What about Goods Loops ? How do they fit in the weird and wonderful world we work in ?
     
  31. deltic08

    deltic08 On Moderation

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    I thought Windermere and Colne were regarded as extended sidings as they have no signalling apart from entry and exit signals like sidings?
     

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