Östra Södermanlands Järnväg, Heritage railway in Mariefred, Sweden.

Östra Södermanlands Järnväg is a narrow gauge railway with steam locomotives that carries passengers through rural landscapes. The line connects two stations separated by a single-track route through the Swedish countryside.

The railway began operations in 1959 from a facility in Södertälje and later acquired the historic Läggesta-Mariefred line. This acquisition made it one of Sweden's few remaining narrow gauge railway operators.

The railway uses narrow gauge technology that was once common for Swedish industrial and passenger transport. Visitors today can experience how people traveled with these trains more than a century ago.

Train rides operate mainly during warm months and depart from Mariefred. Visitors should expect rustic conditions since the trains and coaches are from earlier eras.

Locomotive No. 2 Lessebo is described as the only remaining original-design Mallet locomotive in the world; it is not operational. The Mallet is an articulated design in which the engine is carried on two sets of driving wheels, which lets a long, powerful locomotive take tight curves. The railway's other locomotives carry names such as Virå, Dylta, Hamra and Emsfors.