MBTA Police

I have a question for all you guys on the job or those who are more familiar with this Civil Service BS than I am. I recently moved from one town to another this past year and will be graduating college in the spring, so naturally I want to get on somewhere and am concerned about which town I will actually have "residency" in. However, I was thinking about the T and how they recruit off of the list. Should I put the T as my #2 choice??? How do they pick people??? Thanks in advance.