Here are my first two trains running on the first line. From the starting 1,1 million, I spent ~850 K to this setup. That little green arrow/spade at the engines in the train list shows the priority of the train, it has three levels - besides the "stop" - this is the highest. Trains with lower priority will allow these to pass if met on the same track. Priorities should be set accordingly to the cargo, which has expiration dates. Quicker expiring cargo should wait less, because losing its value quicker - obviously. The value is shown by that row of pale beads, maybe they represent gold coins I dunno.
First train set a speed record on the first run. I left the engine's name on the default.
Since I made a bit of money with the passengers and the mail, it was time to set up some industrial circulation. There's two cattle ranches between Huainan and Xuzhou, and two meat processing plants in each cities, so I placed two stations at each ranch (I connected the one to the east to my existing tracks), bought two engines for hauling the cattle to the plants. These types of cargo worth less, but will help cities to grow.