The Tar Tanker is a rolling stock of the Thomas the Tank Engine De Agostini. The Tar Tanker is a rolling stock and is seen in the television series. It is full of tar that engines deliver and the tar is used for fixing the roads on Sodor. Some Tar Tankers are troublesome trucks and some are just normal in the TV series. This one is just a plain Tar Tanker and is often seen in the classic series (seasons 1-6).