Describe the Suggestion

Currently the sticker block has no functionality when part of a train.
But i believe there is some big potential for unique designs here.

So I would like to suggest the following functionality for sticker blocks:

• when there are any sticker blocks as part of a train, as soon as the train wants to leave a station, the sticker blocks activate.
  They connect to any structure they touch and make this structure part of the train.
  (i guess there has to be some kind of check if the train is still valid with this new structure added to it.)
• when a train stops at a station the stickers deactivate and the structure they have grabbed detaches from the train again.

I imagine a scenario like this, where this functionality can be useful:
Some kind of crane lifts an item vault onto a train (picture a flatbed train car with a container on it).
The train departs with the vault attached to it.
At the destination, another crane can lift the vault off again.
Like this a train can be loaded/unloaded very quickly, an entire item vault worth of items at once.

Screenshots and Videos

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Additional Context

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