In 2005 the Spoorwegmuseum opened the doors of its new building featuring multiple heavily themed worlds. Among them is a walkthrough experience about the first steam driven train and the dark ride called "Stalen Monsters". Stalen Monsters is the first and only darkride make by Dutch manufactured KumbaK and was built in cooperation with Imtech.
The ride was closed for a month in November 2020 for a revision. The ride system received major maintenance work and scenes got upgraded with new show techniques and elements. The biggest change was found in the queue line however. Storywise the ride started out on the attic of grandpa Harry Gommers, whose family has worked on the tracks for three generations. The attic contained grandpa's personal museum with many items on display. This was changed to contain a quiz about the works along the railway. The new version of the ride opened on December 8th, 2020. New show techniques were added by Lagotronics Projects.