Just as many famous European overnight train routes, like Paris to Berlin, have been retired, the Caledonian Sleeper, the train that travels through the night from London all the way to the north of Scotland, is rolling out new carriages in time for summer. For adepts of slow rail travel, the new cars preserve the romance of overnight trains, in contemporary comfort, with a choice of hotel-style suites, classic bunk beds or seats. The Highlander route to Aberdeen leaves Euston Station in London in the evening and hits the Scottish coast by 5 a.m., so travelers who take an early breakfast in the dining car can enjoy coastal views as the sun rises (get off at Leuchars for medieval St. Andrews). Off the train, Aberdeen and its surroundings offer historic castles set in fields of purple heather, in pine woods and along the dramatic coastline. Hiking trails abound on and around the queen’s estate at Balmoral, and rail buffs can visit the former royal train station in Ballater, closed since 1966, and ride on the Royal Deeside Railway a short drive from there.