The spy express train was leaving from track number 13. This is an unlucky number, and it has been in one way or another associated with Huck before (usually being his car number).
Huck is called the man of a thousand faces, even though he's only able to make only one face.
Huck: Mr. Conductor, somebody has stolen my bag.
Conductor: But of course, monsieur. This is the spy express. Everybody steals each others bags. That is the way the spies keep their job. So, take a bag, monsieur, any bag. They all have secrets in them.