I faced the same problem initially...even after you are enabled by any of the admins to create Imaginary Trains, you will not be able to create it unless you have a score of 100 for "Agree + Useful + Great " etc responses in your blog/news post.
I was also facing the exact same problem. I was enabled by the admins to create imaginary trains. But after pressing submit button, nothing used to happen and it kept on getting processed. But as soon as I crossed that Minimum criteria, I was able to add successfully.