Following video is the oldest evidence of Thomas the thermonuclear weapon joke on the internet and possibly its origin. The joke currently exists in multiple forms - one of most popular form, often found in memes, is used as a cover image. Source of the image is here, the original was deleted by its author.
All .stl files are oriented the way you don't have to use any supports. If you decide to print the body as one tall part add brim to make sure it won't fall down. Don't forget to turn off random seams before printing like I did. Chimney and bumper are glued to the body with super glue. All parts are easy prints with minimal overhangs and small bridges.
I also included a model of a realistic TTB (Thomas the Thermonuclear Bomb) which is face of Thomas on a realistic model of Little Boy made for 3D animations. This model is just a joke and it is impossible to print. The printable version of TTB is a combination of 3D model from cover image, Little boy nuclear bomb and my imagination.
The author marked this model as their own original creation.