Katrineholm to Stockholm Arlanda Airport (ARN) train

SJ is a Swedish train company that offers a wide range of services to its passengers. It operates high-speed trains, regional trains, and night trains, all of which are comfortable and reliable. The high-speed trains, X2000, are the fastest way to travel between cities, while the regional trains, Pågatåg, are perfect for shorter trips. The night trains, SJ Nattåg, offer a comfortable way to travel overnight. SJ offers a variety of ticket types, including single tickets, return tickets, and SJ Prio tickets, which offer discounts for frequent travelers. Onboard facilities include free Wi-Fi, power outlets, and a café car. The most popular routes for SJ are between Stockholm and Gothenburg, Stockholm and Malmö, and Stockholm and Uppsala.

Mälartåg is a Swedish train company from the Mälardalen region operating in the Stockholm, Sörmland, Uppsala, Västmanland, Örebro and Östergötland. Mälartåg's train fleet consists of double-deckers and smaller regional trains with a maximum speed of 200 km/h.

MTR Express is a train company based in Sweden. It offers a wide range of services, including high-speed intercity trains, regional trains, and commuter trains. The high-speed intercity trains are called X2000 and offer a comfortable and fast journey between major cities. The regional trains are called Pågatåg and offer a slower but more scenic journey. The commuter trains are called Pendeltåg and are the most popular for short trips. MTR Express offers a variety of ticket types, including single tickets, day tickets, and season tickets. Onboard facilities include comfortable seating, free Wi-Fi, and power outlets. The most popular routes for MTR Express are between Stockholm and Gothenburg, Stockholm and Malmö, and Gothenburg and Malmö. These routes offer a convenient and comfortable way to travel between the major cities of Sweden.