I’m in the Boston area for my dad’s 90th birthday. While taking the train out to South Acton from Boston, I took this photo of the old Boston and Maine Railroad Signal Tower A near North Station. At right, you can see the nose of MBTA locomotive 1138 — one of the T’s many EMD GP40s — pulling a commuter train out from North Station, probably headed to Rockport (the Rockport train departed at the same time as the South Acton train).