You can get the P&LE Dec 2011 asset pack from here:
http://www.otto-wipfel.co.uk/rw-downloads/You can also get a supposedly complete Connellsville-Baltimore beta 6 from there which is said to include the P&LE assets required by Connellsville-Baltimore.
Do not let these asset/route packs overwrite default assets in the Kuju folder unless you know what you are doing and know how to sort out conflicts!
When running into trouble installing and running files from that server, best register yourself at trainsim.com and ask for help from the man himself.