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Stafford resignalling

Current and future British signalling (UK except Northern Ireland)

Re: Stafford resignalling

Unread postby Fast Line Floyd » Sun Mar 27, 2016 3:24 pm

Train approaching wrote:
Fast Line Floyd wrote:I believe that No4 is due down this Easter but I don't know about No5.


Any idea if it's still standing?

No idea at the moment.
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Re: Stafford resignalling

Unread postby Mike Stone » Wed Mar 30, 2016 1:32 pm

Both still standing yesterday.
;
Despite claims that the job was finished early (I understand that as a whole its considerably earlier than originally planned, but the implication was that the actual job had finished early) the first sleeper went via Hixon yesterday morning and the first Manchester-Euston appeared to be waiting at Crewe for the main line to be given up. I was on the first train and we appeared to be cautioned from Yarnfield - there was a phalanx of the "orange army" waiting to wave to us at Searchlight Lane.
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Re: Stafford resignalling

Unread postby S&TEngineer » Wed Mar 30, 2016 1:35 pm

First trains on each line would need to be cautioned to complete the reset of all of the axle counters.
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Re: Stafford resignalling

Unread postby Fast Line Floyd » Wed Mar 30, 2016 2:02 pm

S&TEngineer wrote:First trains on each line would need to be cautioned to complete the reset of all of the axle counters.

Even if EPR had been applied to existing axle counters and new ones signed in fresh? That isn't the way it has been done in the past on Rugby SCC.
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Re: Stafford resignalling

Unread postby S&TEngineer » Wed Mar 30, 2016 2:15 pm

Fast Line Floyd wrote:
S&TEngineer wrote:First trains on each line would need to be cautioned to complete the reset of all of the axle counters.

Even if EPR had been applied to existing axle counters and new ones signed in fresh? That isn't the way it has been done in the past on Rugby SCC.

Not sure you can do that when the interlocking has been powered down. I'll ask at work when I'm back next week (unless you beat me to it).
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Re: Stafford resignalling

Unread postby Fast Line Floyd » Wed Mar 30, 2016 5:11 pm

Good point regarding the locking being powered down if indeed it was as the software could already have been loaded at the last modification, if the locking was powered down then that would rule out the EPR being used but it wouldn't preclude the axle counters being fully up and ready at possession hand back if the techs had reset them after the interlocking was brought on line as they would have to have been to carry out testing.
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Re: Stafford resignalling

Unread postby Mike Stone » Wed Mar 30, 2016 5:37 pm

I assumed that there had been a line proving loco -
;
http://www.realtimetrains.co.uk/train/U ... 9/advanced
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Re: Stafford resignalling

Unread postby Fast Line Floyd » Wed Mar 30, 2016 6:22 pm

Mike Stone wrote:I assumed that there had been a line proving loco -
;
http://www.realtimetrains.co.uk/train/U ... 9/advanced

There usually is one for big jobs.
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Re: Stafford resignalling

Unread postby Mike Stone » Wed Mar 30, 2016 7:50 pm

I didn't notice what the speed towards Stone was, but assume the new down slow is or will be 100 so was slightly surprised to see PRIs approaching Searchlight Lane.
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Re: Stafford resignalling

Unread postby S&TEngineer » Thu Mar 31, 2016 8:36 am

Mike Stone wrote:I didn't notice what the speed towards Stone was, but assume the new down slow is or will be 100 so was slightly surprised to see PRIs approaching Searchlight Lane.

Preliminary Routing Indicators (PRI) are generally provided where no advance indication of route is provided and where, due to equal diverging linespeed (+/- 10mph), the junction signal can show a unrestricted proceed aspect for all divergences without a flashing yellow aspect sequence on approach.
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Re: Stafford resignalling

Unread postby Mike Stone » Thu Mar 31, 2016 11:46 am

Yes, but I wouldn't have thought that applied the totallity of the Stafford scheme was supposed to be raising the slow line speeds to 100 and I would be amazed if the turnout to Stone is 90
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Re: Stafford resignalling

Unread postby Sharpey » Thu Mar 31, 2016 12:04 pm

Mike Stone wrote:Yes, but I wouldn't have thought that applied the totallity of the Stafford scheme was supposed to be raising the slow line speeds to 100 and I would be amazed if the turnout to Stone is 90

Both the "Yellow Peril" and Sectional Appendix concur that the turnout is at full linespeed of 100mph.
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Re: Stafford resignalling

Unread postby S&TEngineer » Thu Mar 31, 2016 2:50 pm

Mike Stone wrote:Yes, but I wouldn't have thought that applied the totallity of the Stafford scheme was supposed to be raising the slow line speeds to 100 and I would be amazed if the turnout to Stone is 90

The diverging linespeed can be equal or up to 10mph less for the 'Free Aspect' junction controls to be applied. The PRI(s) are provided solely to assist in preventing mis-routing at the junction. I will check the SSP when I next get the opportunity and confirm what arrangements have actually been installed.
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Re: Stafford resignalling

Unread postby Mike Stone » Thu Mar 31, 2016 6:27 pm

Oddly Norton Bridge timings are appearing, at least in RTT, for some trains going over the new line
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Re: Stafford resignalling

Unread postby S&TEngineer » Thu Mar 31, 2016 9:06 pm

From the Signalling Scheme Plan (SSP) the new junction speeds and signalling arrangements at Norton Bridge are as follows:

Down Slow to Down Slow - 100mph - Junction signal 'Free Green' with PRIA and PRIB on approach
Down Slow to Down Norton Bridge - 100mph - Junction signal 'Free Green' with PRIA and PRIB on approach
Down Fast to Down Fast - 110/125mph EPS - 'Free Green'
Down Fast to Norton Bridge East Chord to Down Norton Bridge - 40mph - Junction signal approach released from yellow; Flashing yellow and double yellows on signals on approach
Up Slow to Up Slow - 100mph - Junction signal 'Free Green'
Up Fast to Up Fast - 105/115mph EPS - 'Free Green'
Up Norton Bridge to Norton Bridge East Chord to Up Fast - 40mph - Junction signal approach released from yellow; Flashing yellow and double yellows on signals on approach
Up Norton Bridge to Up Slow - 100mph - Junction signal 'Free Green'
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