Jeff Warner's PRR/RDG/WM South Central Region

CTC System

Click on small pictures and larger version will open in a new window.
All Photographs copyright Jeff Warner 2008

Reading/Western Maryland CTC Machine
This is the RDG/WM dispatcher's CTC machine that it used to
control the model railroad.  It is based on a 1950's design
US&S machine.  The black part on top contains a linear
schematic of the railroad, with LEDs to show occupancy.
The green part on the bottom contains the levers for all
switches and signals controlled by the dispatcher.
The phone attached to the right of the desk is to contact
the yard masters and PRR Dispatcher.
The train sheet is seen on the desk.



Entire CTC machine


Main section only


Wing only

Pennsylvania CTC Machine
This is the PRR dispatcher's CTC machine that it used to
control the model railroad.  It is based on a 1986 Conrail
 computerized CTC machine. The red traces on the screen
are train occupancy and the green traces are routes that
have signals pulled up for trains.  The white/yellow is
unoccupied trackage.  The keyboard is used for control of
switches and signals.  The phone attached to the right of the
desk is to contact the yard masters and RDG/WM Dispatcher.
The train sheet is seen on the desk.



Wide angle


Desktop only


Monitor only



Repeater Boards

Repeater boards are located above interlockings "in the sky".
These simulate cab signals and allow crews to easily see signals.


LEMO repeater above layout

Closer view of LEMO repeater

Repeater boards above the layout



Control Panels
All turnouts have slow motion switch machines.
Mainline turnouts are controlled by the dispatchers.
Others are controlled by road crews using local panels.
Note that for this large staging yard, green LEDs show
which track is currently aligned.  Also, since only one train
at a time can enter/exit the staging yard, a power cutoff
(stereo plug) is provided to only power one track at a time.


Control panels for staging

Closer view of Washington, DC, staging control panel



Railroad Electronics

The railroad uses a Digitrax Super Chief and 4 db150 boosters
to provide 25 amps of power.  24 PSX circuit breakers and auto-
reversers are used to break the layout into power districts to help
isolate shorts.  The two C/MRI signaling systems have a total of
12 SMINI nodes to interface with the layout.
OK -- the wiring's not the world's neatest, but remember this
model railroad has already been rewired twice since it was built...


Digitrax DCC

PSX circuit breakers

SMINI Nodes

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