IS this a bug? Trains won't pathfind backwards

[PTTG]

So before I write up an actual bug report, I thought I'd ask if this is a known issue and/or intended feature.

I'm trying to set up a short rail line (~100 tiles) directly connecting my coal mine to my power plant. I want the train to shuttle back and forth instead of turning around, but it's only comfortable driving forward.

To reproduce, build a straight segment of tracks approximately 100 tiles long. Build a normal station at either end. Ensure that the train can stop at either station. Now, program the train to have a looping schedule stopping at first one and then the other.

Expected behavior: The train drives backwards and forwards.

Observed behavior: The train drives forwards, then stops at the forward station and says "no path."

I can of course build turning loops, but those loops are very large and must be at both ends. I'd rather not bother.

[HammerPiano]

It is a feature
If you want a train to go forward and backward, you need a double headed train. (L locomotive, C crago wagon)
L-C-L
Just make sure that each train on the end faces different direction.

[Koub]

[Koub] Moved to gameplay help

[Serenity]

Also make sure you have signals on both sides. Directly opposite each other so they are connected. The signals tell the train in which direction it can go.