Bieszczadzka Forest Railway (Polish: Bieszczadzka Kolejka Leśna) is a narrow gauge railway built in a sparsely populated, forest region of Bieszczady Mountains. Construction commenced at the end of 19th century and completed before the World War I. Nowadays, a part of the railway is utilized as a tourist attraction. Trains run regularly on weekends from the beginning of May till the end of September. In July and August also on weekdays.

http://en.wikipedia.org/wiki/Bieszczadzka_Forest_Railway