This is my second try at this cake. The first one didn't even make it to the blog:) It was a big disappointment to me so I did not post it.
But I am pretty happy with the way my second one turned out, so here you have it.
There are many wonderful tutorials out there. All that I have seen are good. Just Google Thomas the engine cake tutorial and you will have several pages and videos as well.
My advice to you would be, to read them carefully and stick to them.
My mistake with the first one was its face. It absolutely needs to be done 3 days in advance and thus allowed to dry out completely before putting it on the cake; otherwise it will stretch and fall down and mess up your cake.