Glorfindel sighed and pointed her in the correct direction, then indicated the sign near the door they were going through.

It said, "Luggage Car --> [among other things]

"I, uhm, that's what I was doing this morning before I found you. There are now signs in every car, telling you which way to go to get to which car. Even if you start in the wrong direction, if you have time to stop and read, it will keep you from going too far before realizing."