Here is a (big) map of the Orient-Express in 1920, that you can use for the Horror on the Orient Express campaign published by Chaosium for The Call of Cthulhu.
(REMINDER : THIS IS NOT AN OFFICIAL DESIGN, BUT ONLY FAN ART CREATED BY DRAKEN RPG)
(Click on the picture to open the full size version in a new tab, then right-click and save!)