In the real Carlin, there are a pair of multi track grade crossings, one at 4th street and another at 10th street. I wanted to keep my small modeled yard clear of any grade crossings but did find a spot where Main street crosses the Western Pacific line to include one of these interesting features.
The grade crossing that I had set up in Battle Mountain a few years ago was no longer working correctly but the signals themselves were OK so I transplanted them to Carlin. These NJ International signals have lights on both sides and as this crossing would be visible from both sides I wanted to use them here. When I rebuild the crossing at Battle Mountain I plan to scratch build some signals that will only have lights on one side as they can only be seen from the front. In Carlin I am using the crossing controller from Azatrax with the IR transmitter and receiver being in between the ties using the reflective mode. For the sound I am using the ITT Products grade crossing module. These circuits are mounted under the bench work.
The instructions that same with the sound module recommends a speaker with an 8 ohm input impedance. For about $5.00 each on Amazon I found some 2 inch, 8 ohm speakers. I am impressed with the sound quality from these.
These speakers are also small enough to hide in a small structure. This one will be in a 3D printed house that is nearby the crossing. I still need to get the part between the rails done and also some markings on the road.
When I set up this signal, this section of bench work was still on the saw horses and everything worked great. After installing the section into the layout the sensors started to get false triggers. What was happening was that the invisible IR beam was reflecting off the bottom of the cabinets which are 17 inches above the track. I taped up some of the same black craft foam that I used on the roads and that seems to have solved the problem. So I may need to either attached these foam sheets more permanently or paint the bottoms of the cabinets a flat black in this area.