As I said, out of the box it is exactly the same as the Plarail and Motor Road and Rail one, so it should read Tomy underneath. There is no Oliver that reads HiT Toy Company and I'd be super shocked if Mattel was written underneath one.
A TrackMaster item from the US would read its company name underneath, however I've been told by HankAmericanEngine that the only exceptions are the 2007 newbies (Rosie, Duncan, Freddie, Rocky, Sir Handel, Busy Bee James) which read Tomy underneath as presumably they had just been made for the US market but the license handover to HiT Toy Company happened during this time.
A TrackMaster item from the US would read its company name underneath, however I've been told by HankAmericanEngine that the only exceptions are the 2007 newbies (Rosie, Duncan, Freddie, Rocky, Sir Handel, Busy Bee James) which read Tomy underneath as presumably they had just been made for the US market but the license handover to HiT Toy Company happened during this time.