Well I found these which seem to be close but not exact. Not sure if they would work or not. I find it odd that there are so many of these types of trains out there but no one sells the battery terminals and that seems to be one of the more common issues with them.
http://www.mouser.com/Search/m_ProductDe...QItQ%3D%3D
http://www.mouser.com/Search/m_ProductDe...QItQ%3D%3D