This was my best find in Japan. It’s a modern sign, printed on plastic film, for display on the front of an engine. It’s usually back-lit for special effect. I believe that it is for the Kaiji Limited Express, a seasonal service between Tokyo, Shinjoku, and Mount Fuji…
Here’s a Japanese blog that shows the train, and sign at its best
http://blogs.yahoo.co.jp/fujibusa2005/14410193.html
And the sign, in situ..
And an LED version on a more modern train (not so good)