It may be what is known as the Poland Gate on the Main Poland Road out of Conway MA at about coordinates 42.499298, -72.731580. I did find a postcard that seems to depict it at CardCow.com - Poland Gate but that's about all. We may have to ride out that way and see if any of the Conway oldtimers that gather in Baker's Store know about it and the old log shack. If you have any other information, we'd love to know about it. Thanks. UPDATE EDIT: I called Helen at Baker's Store and she verified that the cleft was called the Poland Gate but didn't know if it was man-made or natural. She's going to ask around among the old-timers. I am thinking that grades were too steep in places for a rail bed. If natural, it looks like a great place to construct a toll gate at an earlier time. I remember reading that Conway MA was, at a time, larger than Springfield MA and this could have been a main road south out of town. If so, a toll gate would have been the ideal way to relieve travelers of their money, something this state is very good at with its cash cow turnpike.