The Piaseczno–Grójec Narrow-Gauge Railway (), until 2004 known as the Grójec Commuter Railway (), and colloquially known as the Grójec Line (), 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.Encyklopedia Warszawy. Warsaw: Wydawnictwo Naukowe PWN, 1994, p. 343.Ryszard Mączewski: Warszawa między wojnami. Łódź: Księży Młyn, p. 61. ISBN 978-83-61253-51-8.
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