When you're talking about the T (short for MBTA) in Cambridge or Somerville, you're most likely referring to the Red Line. The Red Line connects the major squares in both cities. Find your way back to this guide to the Red Line stations at any time via RedLineStations.com.

It begins at Alewife in North Cambridge.

The T: Red Line, Alewife Station in North Cambridge

Sarah Zoltko of the Charles Cherney Team at Compass introduces you to the Red Line - Alewife Station.

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The Red Line continues to Davis Square in Somerville.

The T: Red Line, Davis Station in Davis Square, Somerville

Sarah Zoltko of the Charles Cherney Team at Compass introduces you to the Red Line - Davis Station.

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Next stop is Porter Station in Porter Square.

The T: Red Line, Porter Station in Porter Square, Cambridge

Sarah Zoltko of the Charles Cherney Team at Compass introduces you to the Red Line - Porter Station.

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After that it is Harvard  Station in Harvard Square.

Harvard Station in Harvard Square, Cambridge, MA

Sarah Zoltko of the Charles Cherney Team at Compass introduces you to the Red Line - Harvard Station.

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From there to Kendall Station in Kendall Square. (Guide forthcoming)

And then across the Charles River to Boston (first stop Charles Street).