Been playing TTD before (got it like in -96 on 12 floppys or something

And what did i see, massive stations, ive always build point to point before and havent quite yet grabbed the concept of many trains on same lines.
Anyways i gave it a shoot, and the result can u see in the picture included.
Though, it doesnt work out that great, all 3 trains sometimes gridlock before the powerplant junction. How can i solve this?
Also, is there any newb guides on how to use signals? I've only found guides on different junctions, but hasn't really seen any real use of them.
Last question, how do i increase a industrys production the best way? Shall i build 2, 3, 4, 10 trains in the start etc?
Hope i can get some answers
