Ok I worked for NJ Transit for 4 years and can tell you I probulary even know who might be interviewing you LOL. First thing for the testing there really is know way of preparing other than to practive simple math, maintain common sense. Alot of what will be on the test is going to be material that tests your ability: Math, Reading Comprehension, Writing skills and everything else. The only catch is that most of the material on the test is going to be given fast, by that I mean.
Example: 30 Math problems and you have 5 minutes to complete as many as you can and you must deliver on accuracy no partiular score. Problem solving skills ETC.
In the Interview here are some key things:
1- Do research on NJ Transit the company itself. That will show them that you have a great interest in the company
2- SAFETYYYYY thats the bread and butter. Even if you have to make up a story that you helped avert a disaster make it up the love hearing * about SAFETY
3- Show a great interest in the career itself. You want them to believe that you have a great interest in Operating Equipment and not just the money. You dont want to leave that interview and have them believe that your all about money.
4- Show signs of intelligence speak confidently, eye contact, speak confident and your in