Don't know how you create such rolling landforms without a DEM ... But you sure got talent there !
Thank-you for the compliment, although I'm not sure it's any special talent. I did a fair amount of hiking in the Drakensburg mountains as a teen (wrong continent I know, but the same principles hold true). I'm just recreating the shapes I remember from 30 years ago.
I believe that anyone can do it if they are willing to look at the real thing and take their time. Start by blocking in the approximate shape of the mountain, and then gradually carve away anything that doesn't look right. There are such a wide variety of landforms on this planet that unless one is attempting to accurately recreate a specific location, there is a lot of leeway for the creator's artistic license. There are really only a few hard and fast rules to remember: 1) Rivers always take the path of least resistance, 2) Railroad builders take the most economically viable route, and 3) The scenery was there first. I'm tempted to add a fourth: place more trees near watercourses and other wet areas, but there are exceptions to that rule.
It is my opinion that anyone who is willing to follow those few simple rules can produce a good-looking layout.
Anyway, I logged on to post some more pictures, so without further ado, here they are:
118) The Northbound Fast Mail blasts out of the summit tunnel, about to begin its descent towards Wyefield.
119) A few seconds later, it ventures out onto the first of the many bridges.
120) A more distant view from the other side of the track.
121) Blasting through Summit station without stopping
122) A railfan's view from the end of the platform at Summit, as the Fast Mail recedes into the distance
123) A wide-angle shot as it races past the turntable and leaves town. If the crew of that helper locomotive can get it turned quickly, the dispatcher may allow them to follow the mail down the hill.