by PT1101
I apologize if this has already been discussed elsewhere. I looked through the 7 pages of the forum, but could not find any info. Basically, I would like to know what the "SB" refers to on mile post markers located on Pan Am's Freight Main Line between Andover and Atkinson. The SB markings appear on several concrete mile post markers. The SB and original mileages have been painted over and replaced with the current mileages. I have heard everything from "South Boston", "South Berwick", "Salisbury Beach", etc. I was unable to locate any info in previous timetables, maps, etc. Any info would be greatly appreciated. Thank you.