Signals

THE SIGNAL BOX


Railway signalling discussion

ARS question

Current and future British signalling (UK except Northern Ireland)

ARS question

Unread postby Mike Stone » Mon Apr 17, 2017 3:07 pm

I recently noticed on the open train times map a train arrived in platform 4 at Stafford. Normally the route behind it would disappear, but in this case it didn't.
;
Would this be due to ARS selecting the route for a following train?
Mike Stone
Mike Stone
Rest-day relief
Rest-day relief
 
Posts: 1100
Joined: Fri Nov 16, 2007 2:50 pm

Re: ARS question

Unread postby RDNA » Tue Apr 18, 2017 11:00 am

Post by Mike Stone » Mon Apr 17, 2017 3:07 pm

I recently noticed on the open train times map a train arrived in platform 4 at Stafford. Normally the route behind it would disappear, but in this case it didn't.
;
Would this be due to ARS selecting the route for a following train?


No Mike, currently ARS cannot 'overcall' routes, what you saw was probably caused by the signaller operating an AUTO facility for the next train to follow.

This lack of overcalling causes problems where signals on approach to a conflicting point have 'Double Red' controls (for TPWS overspeed purposes) i.e. the next signal in rear is approach controlled unless a 'live' route is set from the protecting signal.

DB
RDNA
Branch line box
Branch line box
 
Posts: 140
Joined: Sun Jan 1, 2012 9:39 am

Re: ARS question

Unread postby rower40 » Tue Apr 18, 2017 8:01 pm

RDNA wrote:
No Mike, currently ARS cannot 'overcall' routes, what you saw was probably caused by the signaller operating an AUTO facility for the next train to follow.

This lack of overcalling causes problems where signals on approach to a conflicting point have 'Double Red' controls (for TPWS overspeed purposes) i.e. the next signal in rear is approach controlled unless a 'live' route is set from the protecting signal.

DB

I've configured ARS to overset routes in specific cases where it allows the previous signal to clear to an unrestricted yellow instead of being approach-controlled-from-red. Great Eastern, Down Main through Seven Kings springs to mind as an example.
It's important to ensure that the route releases after one train before letting ARS set it for the next one, but the first train does not have to have left the section. Also ARS has to be configured to ignore the fact that the route has not proved within the usual 30-second route proving timer.
I agree that what was seen by the original poster was most likely the use of an A-button.
rower40
Crossing box
Crossing box
 
Posts: 65
Joined: Tue Jan 10, 2012 9:59 am

Re: ARS question

Unread postby Mike Stone » Mon Apr 24, 2017 1:45 pm

Thanks - I had subsequently come to that conclusion, and wondered if it was being done to stop ARS crossing trains slow to fast through platform 3, with nothing approaching UF, which makes little sense.
Mike Stone
Mike Stone
Rest-day relief
Rest-day relief
 
Posts: 1100
Joined: Fri Nov 16, 2007 2:50 pm


Return to Signalling - current

Who is online

Users browsing this forum: No registered users and 5 guests