Cologne to Frankfurt am Main train with Deutsche Bahn (ICE,IC,RE)

Hessische Landesbahn (HLB) is a regional transport company owned by the German state of Hesse, headquartered in Frankfurt am Main. It provides extensive bus and rail passenger transport services within Hesse and extends its operations into neighboring states like Bavaria, Lower Saxony, North Rhine-Westphalia, Rhineland-Palatinate, and Thuringia. HLB operates as a holding company with subsidiaries managing rail services (HLB Hessenbahn GmbH), bus services (HLB Hessenbus GmbH), and infrastructure/vehicle resources (HLB Basis AG). Their diverse fleet includes modern train types such as Stadler FLIRT, Alstom LINT, and Coradia Continental trains. Tickets from Deutsche Bahn are also valid on HLB trains.

Intercity is a widely recognized brand for express train services that connect cities over longer distances, often with limited stops and comfortable carriages for long-distance travel. The term \Intercity\" originated in the United Kingdom in 1966 with British Rail's electrification of the West Coast Main Line, becoming a brand for their main-line passenger routes. Today, Intercity services vary across Europe, with some countries like Switzerland offering modern, high-standard trains, while in others, they may be older compared to newer high-speed options. Many European countries use \"InterCity\" as an official brand name for regular, long-distance train services meeting specific speed and comfort criteria. For example, PKP Intercity is a major Polish rail operator connecting cities and tourist resorts within Poland and across Europe. Trenitalia's Intercity trains in Italy offer an affordable and widespread means of rail transport, connecting various cities and towns. These trains typically offer Standard and First Class services, with amenities like power sockets and sometimes catering."

ÖBB Nightjet is an Austrian train company that offers overnight services across Europe. It has a range of train types, including the EuroNight, CityNightLine and Nightjet, which all offer comfortable sleeping compartments and couchettes. The EuroNight is the most luxurious option, with private compartments and a restaurant car. The CityNightLine is a more affordable option, with compartments and couchettes, while the Nightjet is the most basic option, with couchettes and reclining seats. Ticket types include Economy, Comfort and Business, with the latter offering the most luxurious experience. Onboard facilities include Wi-Fi, power sockets, a restaurant car and a bar. The most popular routes for ÖBB Nightjet are from Vienna to Munich, Berlin, Zurich, Amsterdam, Prague and Budapest.