okay. i think i messed up. ii didn't destroy the steam engine, so now i don't have Dernholm on my map. there must be an alternate way to find it out. i hope. does anyone know who else can put it on my map? thank you. V***V
Have you done the quest in the Bessie Toone mine? Percival Toone doesn't know where Dernholm is, but after you've told him the words of his mother's ghost any villager will tell you.
Also, should that fail you, you can 'force' the location by going to it's coordinates. It doesn't damage anything neither! ^_^