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Signalling cables on Marylebone line damaged by fire

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Signalling cables on Marylebone line damaged by fire

Unread postby John Webb » Tue Oct 4, 2016 10:02 am

Picked up from another forum:
http://www.leamingtoncourier.co.uk/news ... -1-7610972

Someone on the same forum asks if radio links could replace the majority of cable links to minimise the effect of such damage. I assume that you are still going to have cables from at least relay rooms to trackside equipment, let alone potential problems of radio interference disturbing radio links!
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Re: Signalling cables on Marylebone line damaged by fire

Unread postby Danny252 » Tue Oct 4, 2016 10:51 am

Perhaps pushing into "Overseas" territory, but I believe the North American ATCS system does issue signalling commands and receive signal/point/track circuit status information (it certainly does the latter) via radio, along with a number of other non-wired systems that I've found mentioned with a brief search (other radio protocols, microwave links, satellite).
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Re: Signalling cables on Marylebone line damaged by fire

Unread postby Mike Hodgson » Tue Oct 4, 2016 12:59 pm

Mkes a change from vandalism and theft of cable. Most of the cabling distance is that from the relay rooms to the locs, and this is what gets stolen. The connection thence to the signal is often vulnerable to damage by on-track plant though. If you're going to use radio, you might as well cut out the middle man - fixed signals - and talk to the train.

It's called in cab signalling of course, and it suffers from a problem that we will have to address for these driverless cars that are destined to take over our roads in the next few decades - how to co-exist with the massive investment in existing equipment that is not yet life expired. These cars don't take orders from a signalling centre but will decide speed by observing their surroundings including other traffic, and will have to avoid collision with vehicles both with and without the new technology.
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Re: Signalling cables on Marylebone line damaged by fire

Unread postby RobMorel » Wed Oct 5, 2016 5:49 pm

The response to it, in the form of Temporary Block Working could be speeded up, trying to resource an entry and exit hand signaller and clip/scotch/padlock pointwork affected (often using the very same staff required for TBW) is being addressed by a trial of Emergency special working. where the driver carries a paper movement authority ticket, no hand signallers required, leaving response staff to secure the route (clip/scotch/padlock). The exit from this area if not clearly identifiable may be marked by a sign (same size as speed restriction stencil) s shown here (lower image) http://www.railsigns.uk/sect25page2/sect25page2.html
So trying to resource 4 handsignallers 2 for each line and staff to secure the route is reduced . Once the affected section is secured and has been 'swept' pf trains already in section, a limited service can resume. (TCB areas only)
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Re: Signalling cables on Marylebone line damaged by fire

Unread postby JRB » Wed Oct 5, 2016 6:19 pm

ETCS like the corresponding American and other systems minimises lineside cabling but has other vulnerabilities as high tech systems always do.
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