In 1984 the circuit was expanded. Between 1988 and 1990 the current route with a length of 850 meters was built. It went into operation for the Baden-Württemberg State Horticultural Show in 1990 and was one of the attractions of this event. During the summer months, the Kleinbahn Sommerhofen-Park is open to the public on Sundays and public holidays. There are steam and diesel locomotives are used, which mainly belong to the association members.