Factorio v0.18.6
Packing Tape v18.1.2
RailLoader v1.0.0

Just encountered a bug that I'm not even sure how to describe.

But first, the easy one: aparently train engines don't pack. I hope this can be added.

As for the "fun" indescribable one ..... While renovating my train system I tried to pick up a loaded bulk rail loader, hoping that it would be packed. It was. Sort of. When I checked my inventory a packed rail loader showed as hoped, but wait, wtf, the map still showed the rail loader in place !? So I tried to pick it up again and got the message "this cannot be mined". Aparently the pick-up process for the bulk rail loader (RailLoader mod) only partly worked. Aparently the rail loader is a two-part unit ... the container and the track. Whats left and showing on the map is aparently the track part, and the image of the whole thing. However it now wont allow the track part to be picked up. And it gets better too ... if I try to put down the packed unit from my inventory, (a) there's no floating image while it's in my hand, and when I click to place it, the placing poof occurs, but no loader appears, yet it's now gone from my inventory.

I'm just guessing but I suspect that your mod isnt accounting for the aparent 2-part nature of this entity and is picking up only part of the object rendering both the part that is picked up and the part that is left only partly functional.

Bulk rail loader is a bit complicated, it places a dummy item (which is what you see when placing it), which it then replaces with the actual entities. The chest itself is invisible, which is why you can't see it when trying to place it. When the chest is mined by Packing Tape, only that invisible chest is removed. It was easy enough to tell Rail Loader to clean up the rest of the entities, but getting it to place the chest and transfer the items correctly doesn't look like an easy fix. For now I'll blacklist it while investigating solutions.

got to love the mods that do wierd work-arounds like that =)

I revisited Rail Loaders and was able to get packing tape to work with it mostly. If you place it off the rail grid, Rail Loaders returns the original item to your inventory instead of the packed version, causing your items to disappear. Other than that it works correctly.

Sweet. Thanks.