I did not put in AI for quick-drive unfortunately; as I plan to extend the route network whenever I get back into route-building, quick-drive AI will get a lot more complex hence I don't have plans for that.

Does spawn ai when play Quick drive ?

High peak

Someone needs to create the cromford High peal railway

Dear Ayman494,
You could make it four aspect where you want the signal close to each other and three where the signals a bit less close and two aspect where the line is very quite. Below 25 M.P.H you do not need Distant signals also know as repeaters. Banner repeaters are not the same as Distant signals.

Too many signals close together at stations then no distant signals in the countryside

Thanks for the tip; I'll make a note of that for the V1.2 update

Dear Ayman494,
The signal by the start should be at the platforms ends and the arrival lines not part way through the junctions and the signal should be at least 200 meters from any point work or anything else which can causes a conflicting move.

Dear Ayman494,
AWS ramp should be placed about 180 meters from the signal or the speed warning board.

I've now updated the route so any feedback on this new version would be appreciated

Oh I completely forgot about roads!

Add these in before / after you have painted your fields but not added scenery.
I tend to use the tarmac brush to plan where they go then go over with the road tool.
going for country side use 2 lane with low or no traffic on them main roads / motorway going through the terrain pick a 4/6 lane road with medium traffic.
you can add in dirt roads to the fields as well if you want but most of the time I leave these out.
mix this up with some run by the rail far from the rail going over and under.
bridge wise smaller road use older brick style and main road use modern larger brick structures

oh and save save save (shortcut is F2)
save your work regularly as last thing you want is it to crash and you loose the 30+ minutes of work you have done only to go and redo it.

Sorry for wall of text
there an 1000 character limit :/

I find this works best as i can then go back to the track and look at what I've built and decide if it looks good or not. as you get further away from the track you don't have to be as detailed you can used 2d tress and bushes rather than 3d, the trick is to always keep the player looking at the nearer fields with higher detail and as you get further out gradually phase to 2d helps make it less of a sudden change.

There is no right or wrong way to do this if you want to use only 2d assets it's your choice & your route.
I find it handy to have a freeroam scenario with a train in it for the area I'm working on as this helps with how it will looks once complete as i can drive past and go 'yeah that looks countryside' or 'this area is missing something'. It also helps to see how much clearance you have with the line-side brush & trees. Shortcut to go to editor mode is to press 'Ctrl + E'

There are many ways to do this but the method I use is:

Paint the fields with the styles you want grass, ploughed , corn etc
as it's UK themed the fields don't have to be very square some can be long and rectangular, wrap around 2 sides of another field. don't paint all the fields from one town to the next in one go do it in stages as it makes the next step less tedious.

Add the walls to the track-side, use the changes in fields next to the track to as markers if you want to mix up the wall type.
next start building the fences/walls for the fields complete a couple of these.
add the foliage:

For track-side brush I tend to use grass - Moor or Grass weeds as I find they have the nicest look and they don't 'overcrowd' scenery around them add some bushes in the re as well trees can be individual or a line of them

For field edges - repeat same as above but don't need the grass/weeds as not as near to the railway.

Thanks very much for the feedback, Xcelatron54! I'm pretty happy with the default textures on the hills and mountains tbf, but I'll change textures up a bit where necessary; tallest mountain is just over 600 metres high, which probably isn't high enough to justify having snow caps year-round. I'll simplify signalling at Ashburton as part of Phase 2 (V1.1) update. Since I am extending scenery northwards, the countryside gaps between the towns will be less mountainous and more open countryside, so what tips do you have to make it look good?

You have made a good start to the route, here's some additions that I'd make to improve what you have already done:

Paint the tall mountains - fully cover with dark grass (add snow caps?) and add some rocky edges few trees add to about halfway up, cover some areas with thicker foliage

Smaller hills - make dark green matches the rest
make you hills look nicer than the default grass and rock mix TS does as default.

Station fences - add some fences to the platforms at Hillbrook & Buxdale between the buildings.

Signals - You have too many signals at Ashburton, you can reduce the number needed and it will still run, it is difficult to explain via comments on what you need to, I can create a diagram to explain & show the signals you would need/ can use.

Got stuck on something? ask me anything, I've been route building for 6 years! Hopefully I can be of help!