Which of the following is NOT a unique rail service offered in Europe?

The Blue Train is not considered a unique rail service in Europe, primarily because it is not a European train service. Instead, the Blue Train is a luxury train service in South Africa, specifically known for its opulent journeys between Pretoria and Cape Town.

In contrast, the other options represent well-known and distinct rail services within Europe. The Glacier Express is famed for its scenic routes in Switzerland, linking Zermatt and St. Moritz through the Swiss Alps. The Orient Express has a rich historical legacy as a luxury train that once connected Paris with Istanbul, and it still carries significant cultural and literary importance. The TGV (Train à Grande Vitesse) is France's high-speed rail service, recognized for its rapid transit capabilities across various French cities. Each of these services showcases the diversity and uniqueness found in European rail travel, setting them apart from the services offered outside the continent.