Hello, I have in my collection a wagon type Taki 3000 (black) Kato with white Nisseki Oil logo. ( http://www.katomodels.com/product/nmi/taki3000_e.shtml ) Unfortunately, I can find no information on the web in which period these cars were with this logo on duty !? As far as I know, the wagons were in service throughout Japan, including Hokkaido ?. Can somebody tell me something about that?