I won't say no to that!
There are three places where you can get an item if you're facing upward and press A. One is in the very back of the train (the caboose?), in the upper left-hand corner of the room where the conductor is. The other two are in one of the small rooms past Ziegfried, and one of them is blocked by the table in the center. If your friend is using a map editor, he should be able to see where the chests are supposed to be.
Can anyone comment on the difficulties in changing map data? I just want to know if making these kinds of changes will affect any of the patches I'm using so far.