Bad Maths? Bad Information?

Spotted this on the information screens at Melbourne’s Southern Cross Station one day last week.

So, it is 10:47am and the Williamstown train is due in six minutes – which would be at 10:53am, right?

Yet it is supposed to arrive at 10:54am – an “early” Metro train? Hardly likely.

So is this bad maths, or bad information from whatever mechanism they use to track train location and calculate expected arrival times?

Either way, not very valuable information.

For the record, the train arrived at 10:58am.