No no no no yes no maybe no
Not necessarily in that order. Well, some of this is opinions, I personally think Railworks LOOKS realistic, but that's all it has going for it. The 40k polys observation is also a factor, fill up a yard with 200 highly detailed freight cars and you'll need Alienware to get 3 frames per minute. Draw distance in RW is a lot lower, about 2000 meters max, the procedural flora looks yummy up close but fades out at 30 meters. Freight cars with 3D ribs look great close up, but the LOD makes the ribs "pop" in and out too close.
Question quotes;
World Building? There was none (well not much) shown. Can you do textures, landscaping, add assets and build like Trainz? If you can, why isn’t this shown more fully? Is it because it’s not as good as Trainz? I’d have thought that this is a key feature required for any keen route builder. The “artists” just seemed to concentrate on loco design, or very basic route creation.
Vern and I disagree on this, I like Railworks "world editor" a lot better than Trainz Surveyor route editing, to me it's easier to lay better looking track, Trainz lacks the ability to tilt objects, and the terrain sculpting tools are a lot smoother, easier to blend terrain textures. Vern has a valid point about the time it takes - Railworks don't have the all-in-one copy and paste, and when you select something like a group of trees to paste on a hillside you have to unselect and reselect what you pasted before you can level them to terrain. Vern has been telling them for years that it needs some type of automatic leveling and they just give him a hard time.
Bad news is the scenario editor - it's a ridiculous Rube Goldberg contraption, unnecessarily complicated and clumsy, ridiculously limited as to what you can do with AI traffic, and buggy as hell. I told them three years ago they needed to rip the whole thing out and start over, instead they kept adding more complex workarounds to try to overcome some of the flaws which added even more bugs. I'm a stubborn bullheaded SOB, if the Railworks scenario editor and AI traffic weren't completely hopeless I wouldn't even be here since I never would have tried Trainz.
Those track textures below the ballast – what an awful looking pebble effect. In fact here seemed to be a distinct lack of good ground textures. Just lots of plain green with track overlaid, for the most part, which simply does not look real. Where there are bursts of under-track texture it looked too spread out.
I created my own terrain gravel textures to blend in with the ballast better, that's a matter of the creator of the route, not a limitation of the game.
40,000 polys for one loco! What spec PC do you need to run these heavyweights?
Actually Railworks runs smoother on my five year old Dell than TS2010 does, Railworks actually requires less horsepower.
Is there a Railworks equivalent of the Download station?
No.
If so, is it extensive and easy to use? If not, how easy is it to get 3rd party stuff?
There isn't much free third party stuff. Main problem is experienced freeware developers had been developing for MSTS and Trainz for over five years when railsim first came out - in order to grab all those people railsim needed to be not merely better than the other two, it needed to be spectacular. It came up very very very short of spectacular, there are many things MSTS and Trainz can do that Railworks can NOT do, even after three years of development.
I didn’t like the way of adding the splines, e.g for track and fences. Much better Trainz style where you can see exactly what you are adding and where, rather than laying some wire frame shape before seeing the result.
I didn't have a problem with that, and I liked the ability to "loft" things so they followed the curve of the track. Might be a newby thing, I've only had Trainz for a few months so I'm still getting used to the tools.
The trees don’t look real. Even when pushed into the background they make the locos and rolling stock look toy-like. Can billboard type trees be used?
Again a matter of taste, to me they look more realistic than Trainz, and you don't get that alpha sorting issue where the branches turn blue against the sky.
Can you get buy a boxed set from a local store and play without being logged in to Steam?
No, you can order a boxed set online, my preference since Nels Anderson has been around for a long time and has a good rep;
http://www.fspilotshop.com/product_info.php?products_id=2425
But last I looked they weren't selling in stores anyplace. "Play without being logged into STEAM", depends on what you mean - you can set it to play in "offline mode" and disconnect from the internet, but only after creating a STEAM account, downloading and installing the STEAM launcher and registering the game with STEAM. AFAIK the game itself won't run without the STEAM launcher, but it's set up to automatically log you into STEAM when you run the game. Obviously that makes for longer loading times even running offline, depending on the system it can take 3 to 5 minutes before you're actually driving a train. There is no non STEAM version.