After a while, production increases. Now, your trains are starting to block each other's paths at the Power Plant. What can you do? Well, if your tracks don't cross paths, your trains can't block each other's pathes. This isn't that important at the Coal Mine just yet, you could just spam trains to make up the money. But the more trains you have, the worse things get at the power plant. So, let's make a one way loop.

First, build a loop around the power plant or opposite it.

Next, link up the station's end that hasn't been connected to yet to the loop.

Add signals to the loop and the connection, making sure to either use PBS to link the station up or use Presignals correctly. Link the loop up to your tracks.

Disconnect any reduendent tracks.

And you're good to go.