PC: Mile posts

[RLA0220@xxxxxxxxx (RICHARD ADER)]

To you NYC people,
Am I correct in assuming the letter or letters
above the number (mile) stands for a town
or city from which that number is miles from?
If so, can someone please tell me what "L"
is on the mile posts along the exNYC track
(now partially abandoned from Jersey Shore
Pa. to Wellsboro Jct. but still intact from the Jct
to Corning N.Y.) ?  Using compass and rule on a scale map, I cannot find
any town or city within the radii of the corresponding number
that begins with L.  This letter is on both sides of the  post along
with the number.  The posts are concrete, about 5' high, 5" thick, and a
foot
wide.  Anyone know where/what L is?
Thanks
Rich