Thomas the Tank Engine by Rev. W. Awdry
If you believe your kids should be indoctrinated in transportationism, you will get them appropriate books. While transportation fiction is a narrow category, kids books about transportation are plentiful. Here are some books and stories I liked for which the transportation technologies are important elements and geared toward younger readers.
The Phantom Tollbooth (book and movie)
Go, Dog, Go! - PJ Eastman (the abridged version is almost poetic)
Don't Let the Pigeon Drive the Bus - Mo Willems
The Railway Series - Rev. W. Awdry
Suggest more in the comments