The Master Plan for the area of Westport calls for it to be turned into a pier (page 47). in discussions with the developer (Patrick Turner) of the waterfront properties it will be turned into a walking bridge to complete a 5 mile loop around the Middle Branch. There are active tracks around this bridge but this is not an active line. http://www.ci.baltimore.md.us/government/planning/images/WestportMtWinansLakelandMP.pdf
But it looks like an active line to me. Can you back up your claim that this line is abandoned?
http://www.ci.baltimore.md.us/government/planning/images/WestportMtWinansLakelandMP.pdf
http://www.baltimoresun.com/news/local/baltimore_city/bal-md.bridge03jun03,0,1629527.story