We'll be taking the Newark Light Rail from Penn Station to NJPAC early Sunday afternoon. We would walk but if it rains, I'd rather take the light rail. We've never taken it before and I'm wondering about accepted payment forms of the ticket machines.

Is it coin-only exact change?
Do they take bills?
Do they take AMEX or VISA?
Also, are they typically on time?

Any help is much appreciated. Thanks.