Train Toy - ABCDary

My Son likes trains a lot, that's because I decided to start this project. The train works with ikea wood tracks LILLABO (http://www.ikea.com/es/es/catalog/products/30064359/) I think these are standard and other brands use the same size.

For the moment I upload Wheels, a Machine and an empy wagon. I am working on the ABCDary wagons. This is a project in progress. Please, if you notice any problem let me know and I fix it.

Hope you like.

UPDATES------

28/5/2014 - Solved a problem with the link between wagons. When you go up and down at bridges the system, sometimes unlinked. That's because it was a 2,5mm link. Now is 5mm link. Look for the "5mm" at the name for the new version. I keep the old one some days.
The Machine now has a a pipe. My son asked it. I also upload a "circles" wagon and some pics.