Don't know anything about the train Sorry!
I was there last week and got the bus from the Port Authority at 9.15am and it took an hour to get to Woodbury. The cost was $40.00 return. I went on a Sunday so the traffic was pretty quiet. I also left it late in the evening to get the bus back so probably missed the traffic again.
Was also there last year and went during the week. The trip took an hour and a half and that would have been in traffic.
Happy shopping! I did very well..........