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Bray Greystones track.

  • 30-12-2016 12:41pm
    #1
    NUTLEY BOY
    Registered Users, Registered Users 2 Posts: 2,345 ✭✭✭


    We did the cliff walk Bray to Greystones this week. On looking down on the tracks I noticed two things that someone might be able to please explain.

    There are parallel tracks inside the normal running rails. What are they for ?

    I noticed what look like long microphones - for want of a better description - pointing towards and away from some of the tunnel entrances on this section. What are they for ?


Comments

  • #2
    tabbey
    Registered Users, Registered Users 2 Posts: 1,943 ✭✭✭tabbey


    NUTLEY BOY wrote: »
    We did the cliff walk Bray to Greystones this week. On looking down on the tracks I noticed two things that someone might be able to please explain.

    There are parallel tracks inside the normal running rails. What are they for ?

    I noticed what look like long microphones - for want of a better description - pointing towards and away from some of the tunnel entrances on this section. What are they for ?

    The additional rails inside the running rails are to provide stability in the event of a landslide.

    What look like long microphones are to detect shock waves, also in the event of rock movement. I do not know the technicalities, but assume that any significant movement would set off an alarm, and result in suspension of rail service pending inspection.


  • #3
    Seanmk1
    Registered Users, Registered Users 2 Posts: 119 ✭✭Seanmk1


    NUTLEY BOY wrote: »
    We did the cliff walk Bray to Greystones this week. On looking down on the tracks I noticed two things that someone might be able to please explain.

    There are parallel tracks inside the normal running rails. What are they for ?

    I noticed what look like long microphones - for want of a better description - pointing towards and away from some of the tunnel entrances on this section. What are they for ?

    The "long microphones" are yagi antennas to provide GSMR coverage in the tunnels.


  • #4
    The_Wanderer
    Registered Users, Registered Users 2 Posts: 2,064 ✭✭✭The_Wanderer


    The inside rails are to contain a derailment if one should occur. Known as Guard rails or Check Rails.

    You would often see them at critical locations on the network.


  • #5
    Fred Swanson
    Closed Accounts Posts: 21,730 ✭✭✭✭Fred Swanson


    This post has been deleted.


  • #6
    goingnowhere
    Registered Users, Registered Users 2 Posts: 4,286 ✭✭✭goingnowhere


    Seanmk1 wrote: »
    The "long microphones" are yagi antennas to provide GSMR coverage in the tunnels.

    Strictly speaking they are for the legacy 400Mhz secure radio, additional antennas are being fitted for GSMR


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