Thank you for your words of praise and interest in my post.
@Jan
If you ever actually make that long drive, you are welcome to join me. The ride from Lüdenscheid to Eslohe will take you directly through Lennestadt. By the way, in Siuerland (Sauerland) there is more old technology to see besides the old steam technology. The Siuerland is an old "iron country" in which small iron hammers (manufactures) have settled at the small rivers already in the 16th and 17th century. They exploited the water power very early. In my hometown Saalhausen alone, a district of Lennestadt, 3 iron hammers are attested.