Talk:Train detection

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Facing Point Locks

I am not convinced this subject belongs on this page. On the FR FPLs were worked by a ground frame lever usually adjacent to the lever which worked the points. There was no train detection involved - except by the eye of the person working the points.

Where they are part of more recent signalling installations I believe the train detection is by track circuit. Mark Temple 24/11/2016.

FPLs at Ground Frames would not have lock bars since the shunter would be expected to see that the train is safely clear of the points. FarleyBrook (talk) 04:29, 25 November 2016 (UTC)

Clear or Normalise ?[edit source]

Treadles are also to clear the starting signals at Porthmadog and Tanygrisiau after the passage of a train.

Surely "clear" should be "normalise", namely "put to stop". FarleyBrook (talk) 03:46, 8 December 2016 (UTC)

You're quite right! I'm glad someone's paying attention. Eheaps (talk) 15:23, 8 December 2016 (UTC)

Round Yellow things?[edit source]

What are the round yellow things with black dots at Rhiw Goch called? Landmarks?

In far away N. S. Wales distant signals on low trafficked lines are usually replaced with a yellow triangle pointing upwards. The design has changed a bit over the decades. These are called "landmarks". "Low trafficked" may mean "trains per week", or "seasonal trains at harvest time?"

Where does the FR design of landmark come from? Was it invented on the FR, or was it copied from somewhere else.

Advantages of the NSW landmark include:

  • no moving parts
  • no need to power a lamp, as reflection from locomotive headlamps provide the power
  • do FR locomotives have headlamps? FarleyBrook (talk) 06:50, 25 December 2016 (UTC)
They are called fixed distant signals. They are used at many locations on both the FR and WHR, often with a W on them meaning that the driver must sound the appropriate whistle code. As far as I am aware there is no nickname for them in common use on the railway. The design and that of the stop boards used in some locations (red with black dots) is based on the disc signals used by the old company with the black dots representing the holes. FR diesel locomotives have fixed headlamps. Steam locos carry lamps when in operation with a more powerful battery lamp being used at night. --Peter Harrison (talk) 07:41, 25 December 2016 (UTC)

Misleading phrasing?[edit source]

The phrase "...a heavy-duty steel sheet was placed over the treadle which was bolted to sleepers" means that the treadle was bolted to sleepers. However, I suspect that it was the steel sheet that was bolted to the sleepers. Or perhaps both? Can anybody clarify?

Dulciana (talk) 15:43, 1 July 2020 (UTC)