A suggestion - HS2 should be built with UK standard platform heights and clearances throughout. I'm not suggesting building the line to UK loading gauge in terms of bridge and tunnel clearances, just using standard UK platform height and lateral clearance for all trains, so they could all use the same platforms at Euston, Old Oak Common and elsewhere, whether 'classic compatible' or 'captive', for maximum operational flexibility.
With no continental gauge connection to HS1 proposed, there are no plans for any through European services and most commentators feel there would be little market for anything beyond one or two 'token' daily services to Paris or Brussels anyway, so to insist on European platform standards for (at least initially) a totally domestic network makes little sense when this also introduces serious complications to operation of the classic compatible trains that must also interface with UK standard platforms elsewhere once they have the left the HS core trunk network. The plan as I understand it at the moment is to have separate platforms at stations where both captive and classic compatible trains will call, including at the major city terminal sites. This means at some stations there may be more new platforms required than would be the case if there was a unified standard, platforms may not be used interchangeably in the event of train or infrastructure failures, and classic compatible and captive sets may not be coupled together to form longer trains calling at the same platform face.
UK platforms are slightly higher and intrude closer to the rail than the European HS standard, but all the HS2 platforms at intermediate stations are on platform loops, so UK platform standards employed there would not prevent full size European stock passing on the through lines at some time in the more distant future. Anywhere such Euro trains DID stop in the future would then require dedicated segregated platforms clearly, which would seem likely anyway for security and immigration concerns, and they will always be a tiny minority compared to the domestic traffic they would run alongside.
To sum up my suggestion:
Build the line as planned to UIC GC gauge.
Build all new platforms at Euston and intermediate stations en route to UK standards.
Purchase captive AND classic compatible stock with UK platform height and clearance specified. Captive carbodies need not be limited to UK classic size restrictions above the platform, so double-deckers would still be possible.
Build a limited number of terminal platforms at non London city terminals in Leeds, Manchester, Birmingham (one or two platforms at each) for possible future conversion to Euro platform standard for future through continental services. Think about security and immigration segregation from other parts of those stations in that design process. All other platforms to be built to UK standard. In the meantime for the foreseeable future, provide conversion decking on the Euro-proofed platforms to bring height and reach to UK standards.
Result:
A standard railway where any UKHS train can use any platform on the system, so groups of platforms at Euston for example need not be dedicated for either classic compatible or captive trains. This brings much more real time flexibility in operations, during construction, and also long term service planning flexibility over the balance in services between the two types of train and how that may change over the years with the size of the network and the extent of through running to the classic network.
Note: According to Wikipedia, Spain uses a non-EU standard platform height of 1250 mm on their standard gauge high speed network. http://en.wikipedia.org/wiki/Railway_platform_height
With no continental gauge connection to HS1 proposed, there are no plans for any through European services and most commentators feel there would be little market for anything beyond one or two 'token' daily services to Paris or Brussels anyway, so to insist on European platform standards for (at least initially) a totally domestic network makes little sense when this also introduces serious complications to operation of the classic compatible trains that must also interface with UK standard platforms elsewhere once they have the left the HS core trunk network. The plan as I understand it at the moment is to have separate platforms at stations where both captive and classic compatible trains will call, including at the major city terminal sites. This means at some stations there may be more new platforms required than would be the case if there was a unified standard, platforms may not be used interchangeably in the event of train or infrastructure failures, and classic compatible and captive sets may not be coupled together to form longer trains calling at the same platform face.
UK platforms are slightly higher and intrude closer to the rail than the European HS standard, but all the HS2 platforms at intermediate stations are on platform loops, so UK platform standards employed there would not prevent full size European stock passing on the through lines at some time in the more distant future. Anywhere such Euro trains DID stop in the future would then require dedicated segregated platforms clearly, which would seem likely anyway for security and immigration concerns, and they will always be a tiny minority compared to the domestic traffic they would run alongside.
To sum up my suggestion:
Build the line as planned to UIC GC gauge.
Build all new platforms at Euston and intermediate stations en route to UK standards.
Purchase captive AND classic compatible stock with UK platform height and clearance specified. Captive carbodies need not be limited to UK classic size restrictions above the platform, so double-deckers would still be possible.
Build a limited number of terminal platforms at non London city terminals in Leeds, Manchester, Birmingham (one or two platforms at each) for possible future conversion to Euro platform standard for future through continental services. Think about security and immigration segregation from other parts of those stations in that design process. All other platforms to be built to UK standard. In the meantime for the foreseeable future, provide conversion decking on the Euro-proofed platforms to bring height and reach to UK standards.
Result:
A standard railway where any UKHS train can use any platform on the system, so groups of platforms at Euston for example need not be dedicated for either classic compatible or captive trains. This brings much more real time flexibility in operations, during construction, and also long term service planning flexibility over the balance in services between the two types of train and how that may change over the years with the size of the network and the extent of through running to the classic network.
Note: According to Wikipedia, Spain uses a non-EU standard platform height of 1250 mm on their standard gauge high speed network. http://en.wikipedia.org/wiki/Railway_platform_height
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