Ok, so you kinda have the right idea for the hump yard. But on your next route Id say place it in the middle. Then set up at least 2 tracks per district on the route. And at least 2 spare tracks.
Now here's what I when I say district. the route could be broke up into switching districts. Now a district could be one town, regardless of its size, or it could be 2 ore more towns with their own yard. Then make a list of what products are needed for each district. So if district 1 has two towns and needs good, autos, coal, steel, lumber, and oil. The person working the hump yard can send cars loaded with those products down the right track, making up a train to head out to district 1.
Then make a list of what each district produces, so the right cars can be sent there. So if district 1 produces wood chips, furniture, and scrap, then the right cars can bee added to the first cut of cars.
So, here's kinda how it would look, when written down.
-Train 387 pulls into the arrival yard. Locomotives are cut loose and go to servicing.
-Yard crew pulls off caboose and rolls it down caboose track.
-Yard crew grabs first cut of cars and takes the hump.
-First 5 cars are general goods. Assuming the route has 4 districts and each consumes goods the first 4 are sent down to each districts respective class track(s). The 5th one is set to the auxlry track to be re-classed latter.
-Next 2 cars are empty tank cars. District 2 produces curd oil, so they are sent down the to the D2 Class track(s).
-Next Car is a covered hopper full of grain. District 1 consumes grain, so that car goes down the D1 Class track(s).
-Next is a set of 3 flat cars with bulldozers that are needed in district 2.
(We now have a box car of goods, 2 empty tank cars, and 3 flat cars on D2.
-After the inbound train on Arrival 1 has been classed out the yard crew heads to the other end of the yard.
-They now pull the cars off of D2's class track and take them to the D2 Departure track(s).
-The next road crew grabs the cars off of the D2 Departure Track and heads out to district 2.
Now here is what I would do when it comes to the naming of industries. Id add what district they are part of in the name. Example Miller ready mix is in district 4, so it could be named "Miller Ready Mix D4" or "D4 Miller Ready Mix."
I would also give each district their own yard, even if its just 3 or 4 tracks. That way the main yard, the hump yard, is building large cuts of cars to send out to the smaller yards as transfer trains. Then in the districts yard, the transfer's would be broken down into locals. The locals would then head off to work the industries.
Now there can be any number of districts, I say to start off, build a route that has at leas 3. But leave room in the hump yard for more. As I said, at least 2 tracks per district, just in case one is filled up. And have at least 2 axillary tracks that can be used as over flow or bad order, or misc cars.
Districts dont have to be physically marked with signs, and they can over lap. For example, District 4 is the north most district. Miller Ready mix is the furthest southern industry in district 4. But Commonwealth Co-Op is 2 miles north of Miller Ready mix. But doing this should be limited and districts should be groupings of industries near their yard.