Buckled Track Repair

 

Although I thought that track work (and track wiring) was complete here on the first phase, it turns out that I was mistaken. Gremlins appeared. In my last post, just a few days ago, I mentioned that the track had buckled on the passing track at Nooksack. After further review I suspect that the cause is not exclusively rail expansion, but at least partially benchwork wood shrinking with the low humidity of our house with the furnace blasting this winter. In addition, the turnout to the left of the buckled track has twisted and no longer lies flat causing derailments. 

At first I considered what I thought to be the easiest solution: unsolder the rail joiners, cut off a bit of each rail, and resolder the joiners. I wouldn't have to make any changes to the wiring; the existing feeders would still be adequate. However, what might happen in the summer when the wood expands? I decided to take a different approach.

I got out my Dremel and using the cutting disk, cut a new gap in the buckled track. After filing the ends of the rail flat, the flex track straightened and the turnout flattened down. The cutting disk left an appropriate gap. I removed some of the ties, filed the rail ends, and slid rail joiners onto the rails. With everything back in place after gapping the rails, both the track and the turnout were realigned. By not soldering the new joiners, the rails can move with the changes in humidity/temperature through the seasons. But. . . now we have a possible electrical gap, as loose rail joiners are notoriously untrustworthy.  

Needing to add a set of feeders to ensure connectivity, I fetched my electrical toolbox. Knowing that this approach entailed dropping feeders, I had plugged in my soldering iron as an early step.  A hot iron, having all materials gathered (yes, literally in a toolbox), and tinning the rail and feeders before soldering the feeders in place made for quick work. I tested continuity between the feeder ends under the benchwork and the rails with my multimeter before joining the feeders to the DCC bus wires with suitcase connectors. Cleaning up and putting the track tub and wiring toolbox away left only a repeat of replacing several ties as tasks in the basement. 

While writing this post, I remembered that I needed to add the new gap and feeders to my "Propulsion Circuitry Diagram" in the three ring binder that I have started towards the Electrical Achievement Program should I chose to attempt it in the future. It is good practice to document what is going on down under the model railroad in any event, NMRA AP or not.