Yesterday, the MBTA announced that it is now offering free upgraded email and text alerts.
You can sign up for alerts for the Subway, Commuter Rail, Bus, Boat, and even Elevators/Escalators and for specific periods of time such as AM Peak, evening, or weekend.
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Disclaimer: I work for the GovDelivery, the company that offers provides these alerts. I'm sharing this information with you because this is awesome news and will help you make better decision on the best way to get where you are going.