Keystone Arch Bridges Keystone Arch Bridges bridge 6 of the original dry laid stone arch train bridges, this one is located at the end of the KAB trail and most of it is not standing however, the insides can be seen showing how the bridges were built, yes they are hollow!  The new poured concrete bridge next to the original is an active line for the Boston and Albany Railroad.  This is bridge 7 in line when including the new concrete bridge built next to the Gator Tooth bridge counting from Middlefield Road and the double arch.

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