Peak fares are charged during the week on trains that arrive at western terminals between 6 AM and 10 AM, and for trains that depart from western terminals between 4 PM and 8 PM. Any passenger holding an off-peak ticket on a peak train is required to pay a step up fee. Passengers can buy tickets from ticket agents or ticket vending machines (TVMs) or on the train from conductors, but will incur an on-board penalty fee for doing so. This fee is waived for customers boarding at a station without a ticket office or ticket machine, senior citizens, people with disabilities or Medicare customers.