That's not right.
What version are you running? If you are running a beta version, the DBR may be "hung" due to an Assertion error message that's being blocked by another window. Once you click ignore on the Assertion error message, the process will continue and should be fine.
Now, if this isn't the beta-versions you may have to kill the DBR and start over. Before you do, empty the following folders. In your Trainz data folder, wherever that's located, empty out cache/internet and cache/libraries. I have found that when the DBR process is taking a long time, emptying those folders helps.