Help pls to ID this freight train

[Super]

We have had this discussion about this engine before but I can't find the thread to see if we ever figured out where it comes from. I think Sunhuntin first brought it up as it was included in a bulk purchase of his. Because of that discussion I bought one too. You are right, it is a DD51. It could be of a vintage year released as on the bottom it has the old Tomy logo with the boy and girl holding hands although I am not sure if it is old or not. It does take a C battery and was made in Thailand. We love ours with its black and yellow stripes front and back.