Ah, Memory Lane...my favorite route!
I won't repeat Tootle, Red Caboose, Donald Duck's Train...all favorites yet in my 'library', but here's a sampling of my top shelf...
The latter, Little Engine That Could, is apparently the favorite of many. The copy I have is apparently a first edition (1930). What's interesting to me is that it's one of a Watty Piper series of books called the Never Grow Old Series. How appropriate! Also, the story line for TLETC was originally from The Pony Engine, by Mabel C. Bragg, per the frontispiece.
Another of my favorites was/is The Big Book of Real Locomotives, "with full color pull-out pictures, each 3 feet long!" Talk about an eye-popping dream-book for a toddling train junky!! But the book was too big for my scanner to post here quickly.
Oh man, I may have to read some of these tonight! Timeless....
KD