Railway

1. 

   Book 1

   The Three Railway Engines

   Reverend W. Awdry

2. 

   Book 2

   Thomas the Tank Engine

   Reverend W. Awdry

3. 

   Book 3

   James the red engine

   Reverend W. Awdry

4. 

   Book 4

   Tank engine Thomas again

   Reverend W. Awdry

5. 

   Book 7

   Toby the tram engine

   Reverend W. Awdry

6. 

   Book 23

   Enterprising engines

   Reverend W. Awdry

7. 

   Thomas and Gordon ; Thomas' train

   Reverend W. Awdry

Book data and covers from Open Library (openlibrary.org).