We stumbled on this steam train by accident - if you plan to go, look in advance when there are steam (rather than diesel) trains running, if that is your objective.
45 minute ride through very pleasant countryside. Very helpful staff, volunteers who are committed to the railway. Reasonable price of 12 Euros return for an adult. The only problem, if you start from Mariembourg, as we did, is that when you are arrive at Treignes at the other end, there is nothing much to do except visit the museum or the cafeteria, as you are a long way out of the village. We may have done better to get off at one of the intermediate stops.
But all in all a very pleasant afternoon, especially, if like me, you love steam trains.
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