The Piaseczno and Grójec Narrow-gauge Railway (Polish: Piaseczyńska Kolej Wąskotorowa), until 2004 known as the Grójec Commuter Railway (Polish: Grójecka Kolej Dojazdowa) is the tourist narrow-gauge railway service in Warsaw, Poland, operated by the Piaseczno–Grójec Narrow-Gauge Railway Society, with the metre-gauge railway (1,000 mm) line. It was originally opened in 1900, and operated as a local transit railway line in Warsaw and it suburbia. Currently, most of the historical lines has been closed, with the remaining stations serving as a tourist attraction.^[1][2]