If it's anything like Amtrak or MBCR, the older guys usually hold the non-revenue jobs.
This is how the testing day goes.
You report to North White Plains to the 2nd floor in the testing room. Someone from HR will speak to you about how to sort out the paper work you were supposed to have filled out completely before the testing date. They will speak about the job, pay rate, union and play a VHS tape dated back from the mid-80's. Then someone from the training department will speak more about the job. Mainly the scare speech about the list, bidding, bumping, etc.
You are then allowed a 5 minute break before the test. First part is a 7 minute timed 40 question vocabulary test, followed by a 30 minute situational mathematics, a 30 minute mechanical test (believe it was around 80 questions), then the 2nd portion of the math test ending with the Hogan personality test. Last part of the math test is compound addition and multiplication. Once you are done with the 2nd part of the math exam, you can begin the Hogan test. It is a 206 question, True or False exam of statements guaging your people skills, leadership, integrity, cognitive skills, and ambition.
With the exception of the math test, everything is done in scantron. When you are done testing, you are done for the day. Pending on how you fare with the background test, credit check, and the test are you called back for an actual panel interview. On that same day they also do a physical agilities test (they advise you bringing a change of clothing). If you pass that, you take a medical, which is a physical and drug screening. Then pending how you did you are offered an employment invite. 7 weeks of training with their book of rules and operating procedures. Then you are on the trains. You are on probation for 60 days and after a year of employment you can choose to apply for another position.
You aren't going to be owning any job at the beginning and they stressed the 2hr call rule. You can request 3 but they said a minimum of 2hrs notice is standard. They also mentioned you can be bumped several times a day, so plan on writing off your social life for awhile.
My best advise: Have your application completely filled out, bring 2 pencils/pens, dress accordingly (remember, you're going for a uniform position), have your cell phone off and listen to directions. I saw quite a few interesting people in my overview and HR has no patience for anything less than what it was told to you in plain english in the invite letter to the overview.