Pulling containers

Hi I am wondering about container hauling in the dfw area I used to work for hub group and all we did was go in there sign up show our license and we were good to go I am wondering if it's like this to get into any rail in dfw haslet rail,Hutchins rail,Wylie rail and if so where or how would I get fright I know coyote and as well as jb hunt and Schneider have intermodal freight but were else can I get loads from also if any one knows how to become a carrier for hub group they require some type of invitation code wondering about that to?