“…making misleading claims and promises in the run-up to the Election”
What an outrageous accusation! Wash your mouth out, Mikey :-)
“It's similar to the way Eurostar can't travel on BR track. “
That’s not quite correct, marshwarble.
When Eurostar services were first introduced in 1993 the only “new build” this side of the Channel to accommodate the service was “Waterloo International” station (in essence four new long platforms built alongside the existing Waterloo terminus) and a short chord linking the Waterloo to Clapham Junction line with the Victoria to Bromley South line. The new service ran from Waterloo, via this chord, to Bromley South then via either Swanley or Orpington to Sevenoaks, Tonbridge and Ashford International. Shortly beyond there the new line to the Chunnel began. All of the route to Ashford (apart from the new “chord” between Waterloo and Brixton) was existing “legacy” track with third rail 750v DC power. Furthermore, the Eurostar services shared these tracks with an intensive commuter service between London, the Medway Towns, Sevenoaks, Maidstone and Ashford. This made for extreme “pathing” difficulties in Eurostar’s early days and it was not unusual to see a Paris or Brussels train stuck behind an all stops Victoria to Orpington service.
In 2003 part one of the “HS1” route opened from the tunnel to Fawkham Junction, just north east of Swanley. From then Eurostars still began from Waterloo and used the old tracks via Bromley and Swanley before joining HS1. In 2007 the final part of HS1 opened from Fawkham Junction to St Pancras and Eurostar services now use this route in its entirety.
The Class 373 Eurostar sets are extremely complicated, having to cope with 750v DC third rail supply, 25Kv Ac overhead supply (on HS1, in the tunnel and in France) and 3Kv overhead supply (in Belgium). Most sets have now had their third-rail “shoes” removed but they are still capable of running on Network Rail’s tracks with 25Kv overhead supply. There were plans to run through services from the north of England to the Continent using shortened Eurostar sets but these never materialised.
HS2 is to have dedicated trains capable only of running on that route and no through services to other routes (including HS1 and the Continent) are planned. Unless plans change it will be an isolated railway.