Polish narrow gauge railways
Polish narrow gauge railways are mostly short sections of old sand-, beetroot-, mine- or simply commuter railways constructed mostly at the turn of XIX and XXth centuries.
Due to economical changes in 1990s, many of the lines have been closed or even dismantled, however some of then are still operating. As - generally speaking - Germans used to be more fond of railways (while Russians and Austrians less) most of the narrow gaude lines had been built in nowadays western part of Poland. The region, that owns most of these still working is Wielkopolska region. In most cases at least one station of a narrow gauge railway is next to a normal-gauge one, so it;s easy to start a narrow-gauge adventure getting there by regular train.
Be prepared, that in many cases local narrow-gauge lines operate only in summer (May-September or even the end of June till the end of August) and during some weekends, so they aren't used for regular passenger traffic any more. But there are still some operating daily, or at least on schooldays.
Starting from the west :