Let’s see how much of this I remember…Thomas and the rest were thought up by an Anglican minister name Wilbert Awdry who told the first stories to his sick child (kid’s name was Christopher, and he’s written some TTE stories too). The first story was Edward’s Day Out. Rev Awdry’s wife pushed him to have them printed, the first book of the series was The Three Railway Engines (which included Edward’s Day OUT) published in '45. Thomas was actually a latecomer, he didn’t appear until the second book, published in '46. New books with 3-5 stories each appeared approximately every year for the next quarter century. I think Christopher Awdry has added about 10 more books since his dad retired. My daughter has a BIG book with a collection of all the original 26 W Awdry books…It’s available in bookstores, on Amazon, or evilBay…It’s called Thomas the Tank Engine, The Complete Collection. (Yes, I read it, and yes, I enjoyed it immensely)
And yes, the TV models are gauge 1, with Marklin mechanisms. Thanks to the second artist Rev Awdry employed to illustrate his books all the engines (except James) have an actual prototype, ole Thomas is actually a Class E2 shunting engine built for the London, Brighton and South Coast Railway. Even more interesting IMO, is that many of the stories were based on actual happenings on British Railways and its predecessors. A railway locomotive did disappear down a mine shaft on the Furness Railway and get spun on a turntable by the wind on the Midland Railway. Also, the people who appear, the fat controller, the fat clergyman, the vicar who saves Trevor were all based on friends of Awdry…The thin clergyman is considered to be Rev Wilbert Awdry himself
Lionel made Thomas and James in Gauge 1, IMO they are very cheaply built and not very good runners. I think they made Thomas and Percy in O gauge as well.
Hornby has made an extensive line in OO and Bachmann is making quite a few in HO
Probably more than you wanted to know…And I remembered mor than I thought I would