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Yes but isn't 20 years a reasonably lower figure than modern signalling design lifespans?

The transition from Overlay to Signals-Away requires all these changes whether the signals are physically retained or not, doesn't it? Given one of the justifications for Signals-Away is the reduction in maintenance benefit, I could see a recovery programme of assets in diruptive positions...

I suspect this is the benefit they're targeting most. Is it known what Classification the 90mph freight will run as? Could be an opportunity to rejig the classes from 4-8 given how little Class 8 traffic there is. Have Class 93s been given type approval yet, the main Class 93 thread suggests...

My point is that LO would be just as likely as GWR to cover the branch out of an existing depot rather than set up a dedicated link. Neither Willesden nor Wembley are particularly far away and the set would likely come empty from there anyway first thing so the main awkwardness is covering...

Being pedantic (important in the legal realm!), is this the ORR agreeing to hear Eurostar's appeal, making no determination on the appeal itself?

Fully agree, and IMO the operational case for Greenford is only there after or as part of WLO. Chiefly because of the likely use of BEMUs. Presumably GWR don't actually train all their crew on it, so how large is the pool of GWR trained crew compared to what LO would have available?

No depot currently has serious BEMU experience in London, although Wembley and Willesden may well end up getting some if the WLO units are BEMUs (which IMO is quite likely). Although WLO probably will have additional stabling added somewhere in the Acton/Willesden area, which could also be used...

Or fit multiple balise readers on each vehicle, which I think is similar to at least one ASDO system in use (TPE?).

It will definitely have one, for the same reason most businesses have one - to gather data. The obvious thing is to do a points-based system, although there's almost limitless variations about how it might be implemented.

I suspect that if BR had kept the branch open for them, both traders would have gone to road anyway within a few years.

Yes, good point about Correct-Side Door Enable (CSDE) which is a separate but related part of the doors control system. Beacon-based CSDE and ASDO may even allow the 'priming' of doors before the train stops (as other railways globally do or some UK light rail systems), which Satellite-based...

On some lines like the West Highland as you say there's an argument for a separate, easier system. Although it's not just the passive balises - it's the train's management system to interpret the message. So for interim fitment on, say, the West Coast south (which is a decent while away from...

Packet 44 Data is absolutely the way ETCS schemes will be looking to do. RIS-2747-RST is the RSSB standard for control of Exterior doors on Passenger Vehicles. It requires use of either track based or Global Navigation Satellite System (GNSS, because GPS is a specific system). Packet 44 is the...

That's only part of Congested Infrastructure. Under the 2016 Legilsation: https://www.legislation.gov.uk/uksi/2016/645/contents/made From Regulation 26: From Regulation 27: From Regulation 28: So by law, the Infrastructure manager must come up with a plan to increase capacity no later than...

Probably not, given any installation would be a new system rather than ongoing maintenance renewal or enhancement of a preexisting installation.

Has there been any news on when 700s will/did start using the Welwyn to Hitchin overlay?

There are serval different ways I could imagine going about trying to get the relevant regulatory approvals. However, anything involving passengers being carried at faster than 25mph will require the fitting of TPWS to the infrastructure and all relevant rolling stock.

East Croydon to just north of Selhurst, wouldn't even need the 2 stations.

Indeed you have, note the entry above Victoria Road Bridge at 13.78 KM saying 1 in 226 down for 482.8m, meaning that from Victoria Bridge south there is a gradient of 1 in 226 down for c.160m.

The 1:226 comes from NR's records. 'We want' is quite different to 'the entire project is unviable without'.