I am impressed with the weathering on the Northern.
back to topic.
A track section runs about 3 dollars each to 10 or more each depending on where you buy it
Switches are steep. A hundred and change each. So careful track planning with thought to your switches is a must. I refuse to use small switches due to experience from two HO scale railroads so... they take space but I know I can reduce trouble.
I may bend a bit and use small switches for the Yard switcher Drill.. but larger engines cannot go there.
Regarding cost. I enjoyed the top end locos and they easily approach 1000 dollars. The O scale train for example is 5 MTH 18 inch with people and interiors and one GGD reefer. That train set was 250 for the pass cars and another 75 to GGD for the express. Throw in a 260 dollar hudson and a 170 helper and you are getting close to a thousand.
Buildings? I have gotten used to the concept that they cost about 100 each. Particularly the Woodland Scenics. They are simply just way better than I could hope to do with my medical issues so... I will plan a thousand dollar town.
And so on.
Where does all this money come from? Well... little by little. It takes me 6 months to a year or more to save up for it.
The benchwork from Mianne which is a custom maker of kits that you put together yourself can be around 200 for a section with legs and top. You can do better from a Lowes and own tools.
Shelving? Literally just a board.. Maybe 8 feet by a foot, assembled into a crude train storage. I have one that is approaching 40 years of service and still doing well.
The model railroading is a journey and I have been told time and time again that this is therapy that takes you away from your real world cares now and then.