Trångsund is a station on Stockholm's commuter rail network, located 18.1 km from Stockholm Central Station on the Nynäs Line in the Huddinge Municipality district of Trångsund.

The station features a central island platform and a ticket hall.

As of 2015, the station had approximately 2,200 boardings per weekday.

[3] After the Stockholm Regional Transport Authority (SL) took over local rail traffic and integrated it into the commuter rail system, a simple ticket booth was placed on the platform in 1973.

A modern station facility was built in 1986 but was demolished a few years later[4] to make way for double-tracking work.