The dialogs were pretty slow, and I don't normally like reading them. It would have been nice with a TL:DR; objective description if I aborted the dialog! Very good looking dialogs though!
Also the sound that was played for each letter felt a bit too frequent compared with how it usually is implemented. Maybe one per word and have the letters come out much faster?
Cutting the trees felt a bit slow and tedious. Would have needed some more umph in it, particles spraying, more sound, tree swaying etc. Otherwise it just looks very stiff and you just have to wait until you can click next tree :)
I couldn't find the coal, sadly. I think doing the basic stuff in the game, like cutting trees, need to feel more fun for the game to be fun to play actually. Also it would have helped if you could reconnect to old rail, because I blocked myself a few times and had to restart. Good thing you had the R to restart!
One thing, maybe an icon for Better Coal could have been shown in the dialog, so you know what to look for out there!