Perkasie (Kasie)
A Reading Company, US&S Style-C, 510-code machine

This machine controlled the interlocking at Perkasie, PA, which single-tracked the mainline thru the tunnel
and controlled some switch locks within the plant for sidings in town.

Finished machine - June, 2005.

The model board was hand painted by the Reading Company. The switch and signal plates are original hardware.
The Switch Heater (Heat) and code plates were all re-created by Mike @

(above) 2/11 - Trial fit of the hardware. The holes are marked, but not drilled, for the code meter and other reset/recall/coding light hardware.

(Left) 1/14/05: The frame, uncrated, dusty and dirty, and in the garage. Fresh out of the crate from Rod Loder out in Oregon.

Installation of the code meter and code function hardware. These plates weres custom made by Mike Burgett of Thanks, Mike! Picture of the wiring in progress. I got a good deal on several rolls of purple wire, which is why I used that color.

Original Picture of the machine, when it was in BY (Bethlehem) tower.

I moved all the rows of levers over so that they are centered more.
The original machine had another machine sitting to the left of it - the levers
were closer to that side so the operator didn't have to reach as far.

Rear of the machine showing the code equipment.
No electronics here - this is the actual code equipment from the original machine.

The 510 LC (Line Code) unit is on the shelf to the left, and an indication storage unit 'pup' is to its right.

The storage and route check relays are all in the large cabinet sitting on the floor.

The line and starting relays are sitting on top of the LC unit.

Click here to listen to an indication code cycle.

The field location consists of an identical 510 LC unit (top left) and another pup (top right), KP application relays (bottom left), and the line/field relays (bottom right).

I am using a DirectLogic DL06 Programmable Logic Controller (hiding behind the KP racks) to simulate switch, signal, and lock movements, as well as route lock and checking and moving of a train thru the plant.

Union Switch & Signal 510 code was a single remote station system.
There were two sizes: 20 or 32 step - which support 18 or 30 controls & indications.
12-step extension units could be added to expand capacity for larger plants.
The office and field location are wired in series with each other.

As with other Union code types, long and short steps are used. However, because
there is only one station - there is no station-select steps. A 32-step unit will
use one step for line conditioning, 30 for controls (or indications), and the final step
for reseting the system. Total coding time: 4 seconds for 20 step, 6 seconds for 32 step.
Click here to listen to a 32-step 510 code cycle

Below are some pictures of the 510 equipment from the manual:
Here's the coder unit.
The same coder is used in the office and field location

510 uses "progressive" delivery of controls and indications.
This means the control or indication is delivered the
instant it is received during the coding steps - where-as
older systems (502, 504) were all delivered at one time at
the end of the code cycle.
Extension unit. Indication storage unit.