Are the incoming trains going on one track and leaving on a different, or are they coming in on two different tracks and leaving on two others? If the former, split it in two with a path signal right in front, one-way. Have two path signals at each outlet of the station facing the station as an exit, and obviously do not make these one-way. If my memory serves, the path signals, since they are facing the wrong way, won't act as a signal block to the earlier path signal, and allow them to correctly function as a station inlet signal. Then you simply use some cross-overs to let the trains in the station to exit normally.
If the path signals don't act as one ways then that may be what I need. I avoided them because they had no doubles like the first signal, so i thought they were one way.
someone help me make train lines that actually earn me money
Find coal mine and power plant nearby, one station on each, one lane, make it a loop (rail enters one end of station and leaves out the other) Add path signals so trains go one direction in loop, add trains. Simplest way to do it.
But assuming you know all this, why aren't they making money? I can only assume you have too many carts for hauling goods so you end up transporting less than the upkeep on the carts for the trains.