I can't give a complete answer, but yard limits were defined in the field by
yard limit signs. Yard limits only applied within the limits defined by those
signs. The timetable indicates stations where "yard limits" exist but the
crews have to be familiar with the actual physical limits so their train is
under appropriate control as they approach the sign. In most situations that
would probably be not much more than a train length beyond the outer switch at
each station.
I can't confirm whether or not the position of the letter in the ETT has your
proposed meaning, although it does seem logical.
John
--- In cpsig@xxxxxxxxxxxxxxx, "Chuck Johnstone" <chuck.johnstone@...> wrote:
A long while ago this note was posted:
http://groups.yahoo.com/group/cpsig/message/4906.
It explained the meaning of the letters on CPR timetables.
This raises a question in how the letters were used. Pacific region TT
(http://www.cptracks.ca/data/TimeTables_Employee/ETT_92_1948_Sep26.pdf)
It shows the following for the Shuswap Sub (I've only included the yard limit
letters):
Revelstoke Z
Clanwilliam
Z Three Valley
Taft Z
Craigellachie Z
Malakwa
Cambie
Solsqua
Z Sicamous Z
Annis
Mowitch
Canoe Z
Salmon Arm Z
etc.
I assume that a letter on the left side of a station name denotes limits on
the west side of a station and letters on the right side designate limits on
the east. I'm also assuming that if a letter is missing the yard limit
extends to the next station.
But if true there many problems. Sicamous works well with the station
entirely within yard limits but what about Revelstoke? It make sense if
limits extended from East Revelstoke up Eagle pass to the west switch of
Three Valley. Or maybe the limits extend from west switch Three Valley to
east switch Taft?
Does anyone know how the limit letters are paired up to form a west-east
interval?
Thanks
Chuck Johnstone
