We
now have a line with 2-3 trains on it and constant double track. Time
to think of further move. Again, we need choosing an industry to
connect.
There are two ways to expand the system. 1st one is to use feeding (transfer trains), 2nd is making straight connections.
Feeding.
type 1 - via main net.

In
this case we will build a 2-track line feeding our main oil with 2
13-car trains. The reason to build 2-track is expanding net to north
corner with lots of industries.
This picture shows the connection between main and feeding line.

.
Also, look at junctions, they connect both line parts. More detailed junctions FAQ coming soon.
type 2 - via feeding line.


Main
point for feeding: never feed backwards (c) energetic. It is better to
move main station this way or to use main line to transport resourse
directly.
In next manual I will show how to do it efficiently to u.