In this post we are going to take those basic concepts of installing a TS2 and expand from one to four total detection blocks that will operate as a communicating Automatic Block Signal system. I want to preface the conversation that with any model railroad signal system, our goal is to achieve "prototype like or prototype based" operations. This system when linked together will do just, so lets jump right in. Quick note - this post is photo and content heavy, but what fun is a blog post without good photos...
Readers: The signals and signal systems that I will be reviewing and installing in my Layout How To series were provided at no cost by Azatrax LLC. However the selection, installation, operation, and opinion of these signals and systems are 100% my own.
3 - Azatrax TS2 Circuit Kits
(Kit includes the board, 2 sets of IR LEDs and IR Receivers with wire leads)
**Note for this specific install we will not use the 1,000 ohm resister**
1 - BLMA 1038 Block Signal
1 - NJ International 1071 Block Signal
2 - NJ International 1037 Short Bi Directional Signals
In addition to the ordered components, you will the following items:
- 3/16 inch #12 Drill Bit
- 3/16 inch #12 Drill Bit
- Small Wire Stripper
- Solder Iron / Rosin Core Solder
- 28 Gauge Wire - Solid in at least three colors
- Signal Tester (Used for BLMA signals which are made with magnet wire)
- Heat Shrink Tubing
- Hot Glue Gun
SENSOR INSTALL - "ACROSS THE TRACK" SENSING
Our previous install I showed you how we could detect the trains using "Reflective" mode which reflected light from the IR LED off the bottom of the locomotive / rolling stock which was then received by the IR receiver causing detection. For two of the three detection blocks in this post we are going to utilize "Across The Track" sensing. The best part for you the modeler is that choice is yours and the TS2 kit from Azatrax uses the same components to detect either way with a small change in how you hook up the wires. It is that easy.
This particular install was going to be tricky since it was on curved MDF board in a helix. Two of the turns on my helix are open, so I saw an opportunity to add modeling interest through scenery and detection for signal operations. Looking at the photo above I chose my location and marked where the block signal should be on each level of the helix. From there I used a 50' railcar to help locate where the IR beam needed to be broken on each side of the signal. When installing in a "Across The Track" setup you want to have the beam cross the tracks at a 45' angle to help ensure as the train passes the IR beam does not get through a cause a false clear.
In preparation for mocking up the sensors across the track, I needed to cut down the styrene tube provided with the TS2 kit. The tubes slide right off allowing you to cut them to any length you need depending on teh install. With each level of the helix being very thin I cut mine down to nearly 1/4 of the original size.
Along with cutting the tubes I need to bend the IR LED and IR receiver 90' for across the track use. Using a jewelers screwdriver I bent the leads very carefully. You do not want to do this often or they could break off.
Using painters tape I temporarily fix the tubes and their IR LED / receiver on each side of the track. It is important to ensure you have the right height and make adjustments before moving on. Aiming the IR LED at the side sills proved to have the best accuracy for detection.
At the same time I was installing the tubes for the LED and receiver, I needed to add my basic landform scenery on both curves. One curve I used primarily Sculptamold and the other as show here I used pink foam. The tubes were mounted on the side of the MDF board using hot glue. I then used either Sculptamold or foam board to secure around the tube to avoid an opportunity to bump and break. Using the ruler to help ensure a consistent aim from tube to tube it is now time to add the IR LED and receivers.
The helix leg support happened to be a perfect platform to run all of the wires from the IR LED and receiver up to TS2 on. The hardboard that the TS2 is mounted on is actually the backdrop for the upper level at Upper Huron. If you noticed we did not need to add a new power supply for this TS2. Up to 10 TS2s can be operated by the same transformer, so we need to do is add jumper wires from the last TS2 power supply to the next one.
Closeup of IR LED and receiver wires coming into TS2 #2. The red and black wires are the power source running from TS2 #1 that we installed earlier this month.
Before jumping into signal install - Test Test Test. After wiring up the IR LED and receiver pairs for each board be sure to Test Test Test with a live train looking for any false sensing or false clears. In the photo above we can see TS2 #3 has both the East and West Sensors lit since the hopper on the left is crossing the path of the East sensor pair and the tankcar in the middle is crossing the West pair path.
Installing the signal we then run the wires up and connect both east and westbound signals to their appropriate locations. It may seem intimidating with the amount wires, but by following the directions step by step you add a few at a time getting this as your end result for each TS2. I use solid strand wires for the signals and the wires that come with the TS2 are also solid, so you can bend wires into a organized shape.
The process repeats itself over for installing TS2 #3 which also uses "Across The Track" detection.
TS2 #2 on the left completely wired and tested. Once complet we move on TS2 #3 to the right and begin the same process. How do we link them together? Great question, we are going to focus on that next.
LINKING UP MORE THAN ONE TS2
So we have installed three TS2's (#1, 2, and 3). While they all share a common power supply, they all still operate independently as if there are virtual blocks on each side of the sensors. We need to link them and by doing so we change the operation from solo to a team effort if you will.
Courtesy - Azatrax LLC
Looking at the diagram above two wires link each TS2 in order. You have the common on both boards and then you link either East to West or West to East. It is that simple and bam.... you have a signal system that works together.
TS2 #2 and #3 are complete on the left and center of the picture. The power supply has been ran from TS2 #3 over to TS2 #4 on the far right of the photo. We will continue the install by discussing how we connected TS2 using "Reflective" mode. Keeping your wires and work area neat and clean is key to proper install and operation.
SENSOR INSTALL - "REFLECTIVE" SENSING
Our last install post focused on installing the IR Sensor pairs for "Reflective" sensing. I do not want to re-hash the entire post since it is easy available just a few posts back, but I do want to show you some creative ways to help when under-layout space may be at a premium.
Back to that comment about premium under-layout space here we have a great example. The install of the sensor pairs for TS2 #4 are on the top of the helix where it comes back on layout. However below the sensors is turn #3 of the helix. There is no way the tubes can stick this far down without the train hitting them. All hope is not lost.
While the tubes are installed in their holes, take a marker or pen and mark where the tube comes out of the MDF board. We can them cut them down to provide accurate clearances for the track below while still using the tube to holster the sensors in between the tracks.
End result = tubes cut down to fit in the alotted space. Once cut we can then thread the sensors and wires through them and install on the layout.
Trimming down the tubes has really improved the clearance for the track in turn #3. Since the wires are solid strand we can bend them up and use tape or a small dab of hot glue to hold them in place along the MDF board.
With our sensor pairs installed and in the clear of the track, we can easily connect them into the TS2.
Test - Test - Test. In the background we can see a test train on curve #4 of the helix coming on layout and operating over both the East and West sensors as they are indicating detection.
Keeping it neat - I opted to use small dabs of hot glue to hold the wires for both sensors and signals in place versus a staple gun. Was it more efficient sure, but the driver behind using hot glue was this install taking place during late evening hours well after my kids had went to bed..... I have learned to work quieter than a church mouse.
Feeding my signal wires for both the eastbound and westbound block signal, I use the same technique of hot glue dabs to secure the wires. There is no doubt extra wire but with plenty of space there was not need to create waste.
Our finished product with TS2 #2, 3 and 4 completely wired and operational. Remember to keep things neat and orderly which makes troubleshooting or maintenance easy to do.
This completes Phase 2 of the St. Clair Sub Signal Install project. I hope you have enjoyed the content and the photos, this was lengthy post. By completing the install of these additional TS2s and linking them together, we have now created a four block operating Automatic Block Signal system. Tomorrow evening I will post on my YouTube Channel and Blog video showing the signal operating together in four aspect configuration. The realism created by the Azatrax TS2 has elevated operations to a new level going forward. I hope you find an opportunity to add this system to your railroad, as it will not disappoint. Please feel free to leave comments or questions and I will do my best to answer them.
Looking opposite westbound we see the westbound signal aspects. The top signal in curve #2 is actually flashing yellow noting "Advanced Approach" while the signal in curve #1 displays "Approach". The tail end of the M-PHBA-01 is ducking under the overpass with the last signal displaying "Stop" since the train is in block.
COMING UP IN SEPTEMBER - (BASIC & ADVANCED INTERLOCKING)
Thank you for stopping by. We will continue with the install series in Mid-September showing how the TS2 performs basic interlocking functions. Our series will come to close in early October showing advanced interlocking functions and a post on how ABS will be integrated with the existing Direct Traffic Control.