Dyce infrastructure pictures

[AberdeenBill]

Hi all,

The redoubling project for the Aberdeen to Inverurie line is now complete and here are a few infrastructure pictures taken today (14 September 2019) at Dyce:

1) LED signals at the south end of the platforms.   These were installed several years ago and originally protected the single-line section immediately to the south but the left-hand signal at least is now automatic and can display a yellow aspect.   The right-hand signal will presumably only see emergency use.   Dyce signal box was demolished as part of the project and the prefixes have changed from DY to HD.    <typo edited>     

2) A gradient marker

3) A new-style milepost.   Some joker has twisted the top around. 

4) Access point information sign

5) Looking north at the new double-track towards Inverurie. 

 

A couple of beginner's signal questions.    When I walk the dog past the station on a Sunday morning I'm certain that there have been no southbound trains since the previous evening, but signal HD7214 shows red.   Can Inverness Signalling Centre 'override' the automatic operation and set it to danger?    Looking north, two signals for the left-hand track can just be seen.    When a northbound train departs the first one resets to red as it passes and so does the second one in the far distance but that doesn't set the first one to yellow, which takes a couple of minutes more.    Are the signals 'too close' for normal track-circuit block operation?

 

Thanks,

Bill

 

 

 

Edited September 14, 2019 by AberdeenBill
typo corrected

[Mark Saunders]

3 minutes ago, AberdeenBill said:

 

A couple of beginner's signal questions.    When I walk the dog past the station on a Sunday morning I'm certain that there have been no southbound trains since the previous evening, but signal HD7214 shows red.   Can Inverness Signalling Centre 'override' the automatic operation and set it to danger?    Looking north, two signals for the left-hand track can just be seen.    When a northbound train departs the first one resets to red as it passes and so does the second one in the far distance but that doesn't set the first one to yellow, which takes a couple of minutes more.    Are the signals 'too close' for normal track-circuit block operation?

 

 

HD 7214 is plated as a controlled signal, meaning to display a proceed aspect the Signalman must change it!  Even automatic signals in some locations can be placed to danger!

 

If I remember correctly HD7214 was the protecting signal for the single line prior to doubling last year.

[AberdeenBill]

11 minutes ago, Mark Saunders said:

 

HD 7214 is plated as a controlled signal, meaning to display a proceed aspect the Signalman must change it!  Even automatic signals in some locations can be placed to danger!

 

If I remember correctly HD7214 was the protecting signal for the single line prior to doubling last year.

 

Thanks Mark yes it was.   HD7214 now shows green for most of the day (after, of course, red and yellow when a southbound train has departed).   The second track between Dyce and Aberdeen was laid last (2018) summer but only connected in August this year.   

 

Bill   

[jim.snowdon]

1 hour ago, Mark Saunders said:

HD 7214 is plated as a controlled signal, meaning to display a proceed aspect the Signalman must change it!  Even automatic signals in some locations can be placed to danger!

From what I have understood, in modern signalling installations (inevitably computer controlled) every signal is a controlled signal, in as much as the signaller can either set it to show a stop aspect or to run automatically. The true automatic signal, without telephone, that could be passed at danger under specific circumstances (stop and proceed) is a disappearing breed, made thus by the advancement in technology from local relay controls to centralised computer control.

 

Jim

[melmerby]

I amused by that gradient post.

1:5000? Is that really important these days or is it just a bit of decoration?

 

Edited September 14, 2019 by melmerby