Hi,
well it really look like a bug and bug are not loved, but once you only start to find one such as mine you don't really have much worry to have
to the thing : If you make a blueprint including a train and then move the train along the rail, you can manage to colide the preview of the train and loc.
I think the picture spek for itself :
factorio buld 45035 for Win64, steam.
PS: you're doing a great job !
[kovarex] [0.17.41] Train blueprint preview issue
Re: [0.17.41] Train blueprint preview issue
Fixed for the next version, thanks for the report.