Here's a sample of European sleeper services, as best I can work out, for comparison with the UK. Information includes planned train composition, the notional owner of the carriages, and any formation changes during the journey.
- Zurich-Amsterdam. This has 1 couchette car, 1 sleeper car (both NightJet-branded) and 4 seat coaches (SBB). At Basel, there is a reversal and loco change (from SBB to DB); an additional 4 seated coaches (DB), 3 couchettes and another sleeper (NJ) are added. At Frankfurt there's another reversal and loco change (to NS), but the whole train continues to Amsterdam.
- Berlin-Graz. This is rather more complicated. Three coaches (1 sleeper, 1 couchette, 1 seated) are part of a train to Budapest; these coaches are Hungarian. Another three coaches (one of each again, NJ stock this time) form the Graz portion. An additional three Polish seated coaches are stuck on the end. This train uses a PKP loco as far as Bohumin, where there is a reversal and change to a CD loco. The three PKP seat coaches are dropped (they might carry on somewhere else, but I can't find out), and five new Polish coaches from Warsaw are added: three (one of each type) are going to Budapest, two (1 seat, 1 sleeper) to Graz. The formation is now Budapest coaches in the middle, and Graz coaches at either end. At Breclav, the formation changes again: shunting happens, and an OBB loco takes forward the two Graz portions; the Budapest portion, meanwhile, carries on with a different CD loco, along with 2 couchettes and 1 sleeper (CD stock) from Prague, and 2 Hungarian seated coaches starting in Breclav.
- Vienna-Hamburg, even more complicated! The base service is Innsbruck and Vienna to Hamburg and Amsterdam, but some nights there's an additional Vienna to Brussels portion. First off, from Vienna there is 1 OBB seat coach, 2 NJ couchettes and 1 NJ sleeper for Hamburg; 2 seats, 2 couchettes, 1 sleeper for Amsterdam (all NJ); and, 3 nights a week, 1 seat, 2 couchettes and 1 sleeper to Brussels (NJ again). Brussels potion at the front, Amsterdam middle and Hamburg at the back. This train goes as one to Nuremburg. (Loco allocation will be covered later!) Meanwhile, from Innsbruck, there is 1 seated coach (OBB, everything else is NJ), 2 couchettes and 1 sleeper for Hamburg, and 2 seats, 2 couchettes and a sleeper for Amsterdam; there are also 3 car-carrying wagons. Interestingly, the Amsterdam portion is in the middle, between the two Hamburg sections. An OBB loco takes the train as far as Munich, where a reversal takes place and another loco carries the train onwards to Nuremburg. At Nuremburg, in less than an hour, some hideous shunting happens that I can't explain as I don't have several hours available to try to work it out!
Out of Nuremburg comes two trains: one for Hamburg, with the loco from Munich, in the order of 4 coaches from Innsbruck, then 4 from Vienna, then the 3 car wagons; and one to Amsterdam (and Brussels), in the order Vienna-Brussels, Vienna-Amsterdam, Innsbruck-Amsterdam. On nights where the Brussels portion DOESN'T run, this train then continues peacefully to Amsterdam; there is a single NS loco booked throughout. When the Brussels portion DOES run, naturally it's a bit more complicated. The train runs as before, but at Cologne it splits; and, on these nights, it uses an OBB loco instead of an NS one. From Cologne, the Brussels portion carries on with the OBB loco it's had from Vienna as far as Aachen, whereupon an SNCB loco takes over. Meanwhile, the Amsterdam portion is taken forward for the remainder of its journey by an NS loco.
You thought the Caledonian Sleeper was a complex operation? Pah, you know nothing!
So, clearly multi-portion running is viable over long distances; these long-distance overnight trains typically depart their origins between 2000-2200, and arrive at their destinations around 0800-1000 (the Berlin train mentioned above is an exception). Obviously the fact that there are lots of spare locos available across Europe, along with facilities for complex shunting (and staff available to do it!) helps somewhat, but it shows that where there's a will there's a way...
Seeing as this is the speculative section, I propose that the Highland Sleeper also has a Bristol/Exeter portion, which combines with the London portion at Crewe (the London portion can then avoid Birmingham, as this market would instead be served by the Bristol/Exeter portion. Alternatively, portions could combine in Bescot yard instead). One mega-train (at least 24 coaches) would then power up the WCML to Millerhill yard, where lots of shunting would take place, to facilitate a portion from everywhere south to everywhere north. (I very much doubt this could take place in Edinburgh station!). On certain days, an Edinburgh-Swansea portion would also run, splitting off the Exeter portion at Bristol Parkway (although, here's a thought! <crayon mode> It could detach at Crewe, then use the Heart of Wales line instead. The coaches could be hauled by one of the redundant Avanti voyagers, which also gives extra passenger capacity for all those very early morning commuters on the HoW line...</crayon mode>). The most important part of this plan is that a large fleet of new couchette cars is built (couchettes seem to make up most of the beds on Europe), and possibly some of those new NightJet pod things as well.
I look forward to all the constructive feedback that my idea will receive!
