Biddeford Station was actually supposed to be a satellite operation of Seashore Trolley, and eventually the terminus for the Trolley Museum. The STM owns all the right of way between their current terminus and that location. However, it would have required that STM buy another electrical sub station, which runs into millions. So that plan died.
I believe all the track has been torn out. I don't know if the passenger equipment is still there, but we believe that the diesel still is, and is available (for a higher price than we're willing to pay, since I am sure someone will ask).
