A rail company in the US has announced that a fleet of new trains under construction will feature ‘party cars’. The high-speed rail connection linking Los Angeles and Las Vegas will have carriages with strip lighting, a shimmery bar and lounge seating. The service run by Brightline West won’t be ready for at least another four years. But if you want a rave on rails, you can try these journeys in Europe where onboard parties are part of the push to make trains more appealing as travellers seek sustainable alternatives to flying. Take a 32-hour party train across TürkiyeThe Turistik Doğu Ekspres…