The Train

How can I deliver the document?

You'll have to make sure the guards don't find it.
Have you tried hiding it...?
...in your compartment?
...in the lavatory?
...in your camera?
Oh, you have? Then, you should be aware that you CANNOT deliver the document.
However, you can deliver its contents.
Your camera can be used for more than tourist shots.
PHOTOGRAPH the document.
You must be clever to avoid the guards destroying your film during the search.