Goodbye analog, hello digital... we've gone DCC. Conversion of the layout took about ten minutes, max - I disconnected the Gaugemaster twin track controller, substituted a cheap Trix unit to operate the point motors, and plugged the Prodigy into one of the two cab control circuits. A couple of evenings of test running proved very satisfactory, and by the weekend I was feeling suitably smug. That, of course, was when things started to go wrong...
A couple of friends were visiting, neither of them with any interest in trains, but they got the layout tour regardless. All was going well, until I needed to back a train into one of the sidings to clear the main line. To my surprise it was dead, with the culprit quickly being identified as the electrofrog crossing, which was no longer feeding juice into two of the sidings leading off it. Cue much frustration and gnashing of teeth, as I tried to identify a loose wire or broken connection in the under board wiring. No joy. Not wanting to be a bad host I shut the layout down and went downstairs to do the entertaining, but it was weighing on my mind all night. In the morning I had another poke around, in the hope that the fault might have magically cleared itself overnight - this has happened before, so it's not a completely foolish wish. Not this time, though, and in the better light of morning I still couldn't see any loose connections. We spent the day out with our friends while my mind raced through worst event scenarios. If something had gone wrong in the internal wiring of that crossover, it was game over - I'd have to lift the ballasted unit, and I couldn't do that without damaging the four sidings leading off it, which - given that one of them has a road running across it - would in turn impact on scenery that had taken a lot of time to get right. In the back of my mind, I remembered some scare stories about the internal leads in Peco points not being able to withstand DCC voltage/currents - had that happened, I wondered?
Back home, I wasn't overly keen on poking around with the wiring while it carried DCC, but I needed to be able to test the track power. I dug out a multimeter - not my usual one, which I've mislaid - and couldn't get it to read a sensible voltage. I then decided to swap back to DC for exploratory purposes. Five minute job - no problems. I ran a loco up and down and the crossover was still dead. It wasn't some transient problem, then, or something esoteric related to DCC specifically. I then decided to get technical and give all the track feeds running into a crossover a good yank, for no other reason than I vaguely recalled something similar happening a year or two back, before I completed the ballasting. I did so, and thankfully my test loco roared into life. Some further running established that power was now flowing back into the previously dead sidings. I then converted back to DCC and things have been fine since then.
OK, it's not a very elegant solution - and something is obviously not quite 100% in that crossover wiring - but I'll have to live with this state of affairs, as unsatisfactory as it is. I'd rather accept the need to tweak the wiring every year or so, rather than rip up a year's worth of scenery and ballasting.
Other than that, it's been pretty stress free. I spent some time learning about speed curves, so I could tune my two SD35s to run together, and I did some more CV tweaking to get the F unit consists to run properly. I've dug into advanced consisting with only limited success - I can get my B23-7s to work as a consist, but not the SD35s or SD24s, for some strange reason, even though they should all support advanced consisting. For now I run these units together in pairs by assigning the same address to both locos. A mystery, but probably not unrelated to my general ignorance levels at this point. I have also identified and (hopefully cured) a couple of areas of dodgy wiring which gave only transient faults in DC.
Overall I am very happy and am enjoying the increased operational flexibility. The layout was already divided into enough blocks to allow all the movements I could envisage, but it did sometimes mean a long wait for a slow freight to clear the longest block. And while the slow speed running was good under DC, it's amazing under DCC.