I found this image of Kumamoto Station on eBay. I couldn't find a date but it must have been taken before WWII, as the Japanese is written from right to left, horizontally. The picture presents quite a contrast with the new facilities that have been put in place to prepare for the arrival of the Shinkansen.
http://cgi.ebay.com/ws/eBayISAPI.dll?VISuperSize&item=120691240254