Here we can talk about train character ideas not related to Thomas.
For example: Casey Jr.
http://joel-swedish-dragon.deviantart.com/art/Casey-Junior-with-Circus-train-87837816
Katy the caboose. http://www.billpeet.net/PAGES/katy.htm
Tootle and Katy Caboose(unrelated to above character)
http://www.amazon.com/gp/product/images/0307120872/ref=dp_image_text_0?ie=UTF8&n=283155&s=books
Tillie from the little engine that could
http://ecx.images-amazon.com/images/I/51YRSXTH9JL._SL500_AA280_.jpg
Here are more
Blue
http://www.majhost.com/gallery/Tonypilot/Sprites/blue.bmp
Huey
http://www.majhost.com/gallery/Tonypilot/Sprites/huey.bmp
Ivor
http://www.majhost.com/gallery/Tonypilot/Sprites/ivor.png
Pufle
http://www.majhost.com/gallery/Tonypilot/Sprites/pufle.png
Toots
http://www.majhost.com/gallery/Tonypilot/Sprites/toots.png
Here are more:
Galaxy Express
http://www.majhost.com/gallery/AllAmericanBoy9/Sprites/ge888.png
http://www.majhost.com/gallery/AllAmericanBoy9/Sprites/ge444.png
How about Supertrain?
http://nbc_supertrain.tripod.com/