Signal aspects

[NW Modeling List]

Ron:
 
The DIVERGING APPROACH was an indication  particularly
in use on the ex-NKP main line Buffalo-Chicago.  This  was
traffic control territory, mostly single track with long  passing
sidings.  The siding turnouts were #15's good for 30  MPH,
so therefore "at prescribed speed"  comes into play.  
Translation - "Go in the hole at 30 MPH , but be ready  to
squat at the other end".
 
The RESTRICTING has many applications, but as it  applies
to sidings --  there are sidings where the rails  aren't
bonded, therefore the entrance signal can't detect
whether or not there is a train in the siding, a  broken
rail, a switch not properly lined.   The  maximum
for RESTRICTED SPEED is 15 MPH, so most of the
turnouts to a non-bonded siding are only good for
15 MPH and the entrance signal displays RESTRICTING.
 
On the UP between Las Vegas and Barstow,
there are examples of these non-bonded sidings.
A freight received a RESTRICTING to enter the siding
at Dawes to clear a passenger train.  The  freight
moved through the turnout, headed onto the siding
and was diverted to a stub truck where  maintenance
of way equipment was stored.  BAM !  The  crew
placing the equipment on the stub track had  neglected
to line the turnout for the siding.   Who was at fault  ?
 
Translation:  "You break it' you buy it."
 
                                               Harry Bundy



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