DB NachtZug

City Night Line, abbreviated CNL, was a train category of German railway company Deutsche Bahn for overnight passenger train services between Germany and neighbouring European countries. In late 2015, Deutsche Bahn announced that it planned to terminate all night train services in December 2016, and this plan was implemented on 11 December 2016. The service on some CNL routes was replaced by ÖBB Nightjet services.

In 1998, Deutsche Bahn hived off its night train services, which were provided with the train categories EN (EuroNight) and UEx (Urlaubsexpress), from DB Fernverkehr AG to DB AutoZug GmbH. One year later, the CityNightLine AG company, domiciled in Zurich and until then a joint venture operated by Deutsche Bahn and the state-owned railways of Austria and Switzerland, ÖBB and SBB, became a wholly owned subsidiary of DB Fernverkehr AG. It was run by the same management team as DB Autozug GmbH, so that responsibility for all night train categories, which still form the core element of the City Night Line network, lay with one single source from then on. The management of services, rolling stock and pricing of CityNightLine and its then DB counterpart (NachtZug), however, remained separate.

Parallel to the integration of the two companies, the DB Autozug GmbH night trains were renamed DB NachtZug. On introduction of the new timetable on 15 December 2002, the DB Nachtzug portfolio was increased to 20 trains. Following the emergence of low-cost airlines and the expansion of the international high-speed rail network, DB realised it had to adapt its night train services to the changing requirements of the transport market. The target was to establish overnight services as a supplementary product to high-speed trains over long distances (between 800 and 1500 km). To achieve that objective, the existing train categories CityNightLine (CNL), DB NachtZug (NZ) and UrlaubsExpress (UEx) were amalgamated to form one new product called City Night Line (CNL), which was integrated in the fare systems and sales processes of the different departure countries. The line network was then redesigned to reflect these new objectives: routes which ran parallel to long-distance services were discontinued, other routes were systematically extended, destinations with strong seasonal fluctuations and tourist destinations were replaced by daytime services. In the course of this bundling process, older passenger cars were taken out of service. Since then, the entire fleet of sleeping, couchette and seated cars has been fully air-conditioned. The cars were given a uniform livery in white with red window stripe and all-white doors. The service was standardised on all lines.

...
Wikipedia