Modeling Franklin Jct.
(No. 81-858) protects the other CNJ ap- proach. These assembled signals have a three lead bi-color LED which will provide the appropriate indication.
Wiring
The normal position of signals at the crossing is for the Lehigh Valley. This simplified the wiring requirements for the nine target heads and enabled the signals to be manually operated by a DPDT slide switch. By cross connect- ing the terminals, the polarity of the LEDs is reversed, changing the color. The signals are normally set to display green over red (Proceed clear) over the Lehigh Valley eastbound and west- bound tracks and Stop (red over red over red, or red) for the CNJ. When the DPDT is thrown for CNJ trains to cross the junction, Stop (red over red) is displayed over the eastbound and westbound LV tracks, and Proceed Slow (red over yellow over red on the signal bridge, and yellow on the SA sig- nal) for the CNJ track.
The author’s freelanced three track signal bridge, which controls one side of the junc- tion, was patterned after the four track eastbound home signal bridge which was located northeast of Franklin Jct. The basic bridge structure was made by removing two inches from the span of an IHC (No. 5011) four track signal bridge.
middle head of the CNJ signal, which requires a three lead bi-directional LED (Mouser No. 604-WP93WEGW or Miniatronics No. 475-1223005). This will enable this head to display a yel- low signal by connecting both the posi- tive and negative leads.
The most difficult and tedious part of this signal bridge is wiring the LEDs. Radio Shack No. 30 magnet wire (278- 1345) was used to connect them. Thir- teen pieces were cut to length to reach terminal strips under the roadbed. Af- ter soldering the magnet wire to the LEDs, the wires were slid through holes in the mast, along the bottom of the bridge structure, then down the sides of the bridge and through a hole drilled in the bases. Six wires were grouped on one side and seven on the other. After all the wires were run, black thread was used to secure them tightly against the bridge frame start- ing near the target base. The magnet wires were then painted Weathered Black to match the bridge frame.
Other signals I did not have enough room on the
LV west side of the junction to install a multi-track signal bridge. I settled on a N.J.
70 International cantilever signal
bridge (525-4004) and installed a brass tube signal mast with Oregon target heads, platforms and brass ladders. Bi- color 3mm LEDs (Miniatronics No. 12- 220-05) were again used for the two signal heads. A Tomar SA type searchlight signal
Of the six signal heads on the bridge, four do not change. These four and the lower signal on the cantilever bridge are directly connected to the 12 volt d.c. power with a 470 ohm resistor on the positive lead. The middle terminal of the three-lead LEDs is connected to the 12 volt negative terminal. Both of the other leads are connected to the center terminals of the DPDT switch through 680 ohm resistors, as are both leads of the two-lead LEDs using 470 ohm resistors. Depending on the sup- plied voltage, the 680 ohm resistors may need to be changed to obtain an acceptable yellow light. A diode is used on one side of the DPDT to obtain a red or green signal as desired.
LV Westbound
Franklin Jct. wiring diagram CNJ
LV Westbound Westbound LV Eastbound
CNJ Eastbound
470 ohm
470 ohm
680 ohm
Diode
470 ohm
470 ohm
12v –
470 ohm
12v +
DPDT AUGUST 2013
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