Late Trains on a Friday Morning

It figures that the one day this week I take the train (two days off, two days driving), that the train is late by almost an hour. I hopped on the train at about 7:20 at Grafton, only to find out it was the p506 (usual departure time is 6:44 AM), so we made all stops into Boston, arriving at 9:00 ...

I wonder what happened to the p508? Did it ever pass the p506? I recall hearing an announcement in Natick that the p508 was behind us, but I don't recall another train passing us, so waiting for the express wouldn't really have helped.

Hope everyone enjoys the long weekend!