A quick Factorio tutorial showing how to make short bypasses allowing for multiple trains to travel different directions on the same rail line.
If you have a low-traffic rail line that is only 1 track wide, you may find yourself needing to have more than one train traveling opposite directions on the rail. This tutorial shows the basic design of a short bypass which allows trains to allow opposing trains to pass them before they continue on. This isn’t advised for high traffic routes, but because of resource scarcity or sheer distance of the objective it’s sometimes necessary to build such a system.