Passenger Information System: Design Manual for the Swiss Federal Railways by Josef Muller-Brockmann

If you're a fan of SBB and Swiss Rail, this is the book for you. It's essentially a very detailed guide to the graphic standards applied to Swiss Rail and explained in both English and German. I love it. The book - albeit softcover - is covered in a protective clear plastic cover which is very nice and gives the book a premium feel. Everything about this is first class, from paper stock to overall design.