SHJ Interlocking

[Jim Holland]

Greetings!

Jim Holland wrote:
> 
> Greetings!
> 
>         A *Traction Heritage* Xerox (don't know the issue, but it is 
> page 31!!!!!!!) talks about the interlocking at SHJ.  I quote:

	"Between 6 a.m. and midnight 1,825 street cars are scheduled 
through the Mt. Washington tunnel of the Pittsburgh Railways."

	Don't know if that is one way for a total of 3,650 both 
directions or if the 1,825 is a total for inbound and outbound, but that 
works out to be almost 1.7 streetcars  p-e-r  m-i-n-u-t-e  o-n  
a-v-e-r-a-g-e!!!!!!!  Imagine what this must have looked like in the rush 
hours!

	The article goes on to say:

	"At the south portal of the tunnel is a wye junction, which is 
the most important on the entire system. . . Adjacent to the wye is the 
South Hills administrative building of the company, from which all 
service for the South Side local routes originates, . . . Together with 
these conditions, the topography and the density of service, together 
with lack of convenient rerouting facilities make this location highly 
important.  It also necessitates a special means of route interlocking 
for the protection of conflicting movements."

	This article was written by R. C. Sutton, Supervisor, Signals, 
Power and Incline Division, Pittsburgh Railways.

-- 
James B. Holland
       PITTSBURGH RAILWAYS COMPANY (PRCo), June of 1949 -- June of 1953
       To e-mail *off-list,* please click here: mailto:pghpcc at pacbell.net
N.M.R.A.  Life member #2190; http://www.mcs.net:80/~weyand/nmra/