Instant Transport between train stations

Issue description

Ore was transferred between train stations instantly with or without train present.

I was redesigning and testing a train route between copper mine and a smelter. I was emptying the buffer storage at the ore unload (while testing truck throughput in a loop) and noticed the station was continually full no matter how much ore I pulled out.

some investigation found that even without a train present, the load station was filling, and the unload station was unloading.

When initially discovered I had paused the single train (I think). Unpausing, skipping stations and resetting the route had no effect. I also paused and unpaused the stations.

The attached save is after several fix attempts and I was saving to reload. I have some saved from just before discovering the issue as well.

only fix was eventually rebuilding both stations.

Reproduction steps

1. Load attached save.
2. Observe copper ore station instantly sending ore to the copper smelter.

Game version and build number

v0.7.4 b441

Operating system

Windows

Attachments

broken.save

Files not imported: broken.save

I can't seem to reproduce this issue anymore; for me, the train fills with copper as expected. I guess we fixed the issue as part of fixes in a few recent rounds of patches. If you hit this issue again on the latest version, please don't hesitate to file a new bug. Thanks!