There is one direct service per day between Cologne and Prague, although there are plenty of indirect services that involve a change at Berlin (although that route is dealt with on a separate page). This service is operated daily by Deutsche Bahn's City Night Line sleeper service, Kopernikus / Phoenix, and calls at Berlin en route.
City Night Line
City Night Line services operate between a variety of European cities, allowing passengers to make the most of their travels, whilst saving on hotel bills. There are two fare classes; economy and deluxe, and three classes of comfort on-board the City Night Line service:
Sleeper Car
Counchette Car
Seated Car
Sleeper Car
Included in the price of your sleeper car ticket is bedding (incl. duvets and pillows), air conditioning, breakfast, washing facilities (shared toilet per carriage), toiletries, towels, and drinking water. Passengers travelling in deluxe class also benefit from a free drink on arrival, as well as a private en-suite shower/toilet.
Couchettes
Four and six berth couchettes are available, both privately or shared. Single sex and wheelchair accessible cabins are also available. Each couchette features bunk-bed style beds, a lockable door for the room, luggage storage, pillows, blankets, sheets, shared washing facilities and toilets in each carriage, and temperature controls in each room.
Seats
The cheapest travel option on-board the City Night Line service is in the seating car. Two seating types are offered: open-plan reclining seats, and six-seat compartments. Shared washrooms and toilets are available in each coach, and blankets are available upon request.