Factorio Forums

With the change of making the locomotive stick to the station when placing it, if you place a locomotive on a station which is near another set of rolling stock it may join their train group depending on how close you place it (because the bounding boxes overlap), even though it shows as it will stick to the station.

Thanks for the report.
It should be fixed for 0.15.24

I thought that looked odd when it happened yesterday, while I was upgrading all of my oil trains with extra locomotives. Didn't even think to report it as a bug, and here it is resolved for the next patch.