Rail transport in Sweden uses a network of 10,912 kilometres (6,780 mi), the 24th largest in the world. Construction of the first railway line in Sweden began in 1855. The major operator of passenger trains has traditionally been the state-owned SJ, though today around 70% of all rail traffic consists of subsidised local and regional trains for which the regional public transport authorities bear responsibility. Passenger traffic has increased significantly since the turn of the millennium, and in 2019 Sweden ranked number five in the world and number three in the European union, as well as number six in the world when measured by passenger share.

SJ is a government-owned passenger train operator in Sweden. SJ was created in 2001, out of the public transport division of Statens Järnvägar, when the former government agency was divided into six separate government-owned limited companies. In 2018, SJ carried 31.8 million passengers.