ABCL vs. AOCL+B

Discussion in 'Infrastructure & Stations' started by w0033944, 3 Mar 2014.

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  1. w0033944

    w0033944 Member

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    Just a quick question - I'm familiar with the addition of mini barriers to AOCL crossing in Scotland to convert them to AOCL+B spec, but I'm unsure as to how these crossing differ from existing ABCL types (my excuse is that AHBs and MWLs are more common in my area (with a few of the MCB-OD installations for good measure).

    Thanks in advance.
     
    Last edited: 3 Mar 2014
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  3. The Planner

    The Planner Established Member

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    I was always under the impression that AOCL+B were bolt ons to existing AOCL and don't actually get installed as such?
     
  4. w0033944

    w0033944 Member

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    Sorry for the imprecise nature of my question - that's how I understand it as well.:oops:
     
  5. Railsigns

    Railsigns Established Member

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    With the AOCL+B being a 'bolt on' to the existing AOCL circuitry, there are subtle differences in failure modes and how they operate under local control compared to an ABCL, hence the different designations.
     
  6. w0033944

    w0033944 Member

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    Thanks - as I suspected, the average road user would notice no obvious difference.
     
  7. Trucker Glen

    Trucker Glen Member

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    The only real difference is whether there are phones.
    Most of the existing ABCL crossings have phones and also the 784.1 signs instructing drivers of large and slow vehicles to phone before crossing, like at AHB crossings.
    But AOCL+B conversions retain the blue "to contact railway" signs without phones.

    [​IMG]
    Acheilidh No2 level crossing by Inverness Trucker, on Flickr

    [​IMG]
    Hoy level crossing by Inverness Trucker, on Flickr


    Although, Halkirk, which was converted from AOCL to ABCL doesn't have phones and got somewhat larger "to contact railway" signs.

    [​IMG]
    Halkirk level crossing by Inverness Trucker, on Flickr
     
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