As eager commuters headed to Melbourne's newest train station on Sunday, they arrived to find the myki system out of order.

It meant that for more than an hour, passengers at the $110 million Williams Landing station couldn't buy or top up myki cards at the counter or from the lone myki machine.

Minutes before the system crashed, Victorian Transport Minister Terry Mulder was talking up the Werribee line station, which will service Point Cook and future residents of Williams Landing.