PC: PC Employee TT

["James Reaves" <Jereaves@xxxxxxx>]

In the PC employee TT's there are listed Arranged Freight Train schedules
for the various divisions covered (in my case Eastern Region). Anyone know
what the train symbols mean, i.e. TH-1? I assume TT-23, for example, is a
TrucTrain, but I'm at a loss as to the others (then again a TT could be a
Tropicana train!).  I searched the timetable for a legend or index but could
only find the ones that applied to passenger trains. Any help would be
sincerely appreciated!

Thanks,
Jim Reaves
Baltimore, MD