As reported last month, I was having a problem with the TCS WOWSound decoders I’m now using for all of my steam locomotives. If I started a locomotive at speed step 1, it would take off at full speed.
I wrote to the manufacturer and was advised to not use the user-loadable speed table feature on the decoders. Okie dokie.
(I like using my own speed tables because the top speed on most locomotives is way too fast for our layouts. The result is, operators end up working with the bottom third, or bottom quarter, of the throttle. It’s kind of like having a speedometer that reads up to 500 kph (310 mph) when the vehicle can’t go more than 50: The rest of the dial is wasted space, and there’s no fine speed control available at the low end. By writing my own speed tables, I’d given operators full use of the throttle.)
This morning I turned off the speed tables, and decided to see if I could achieve acceptable performance using the starting/mid/max settings of CVs 2, 6 and 5. I did – quite quickly, in fact – and the locomotives no longer tear off at full throttle if set to Speed Step 1.
While few others will benefit from knowing the settings, I’m putting them here so that I can refer to them down the road.
CNR Moguls 80, 86, 908: CV2 = 2; CV5 = 60; CV6 = 30.
CNR 10-wheelers 1532, 1560: CV2 = 5; CV5 = 50; CV6 = 25.
Why the differences in settings between the two classes?
Well, I set CV2 – starting voltage – so that the locomotive would just start to move at speed step 1. The 10-wheelers needed a little more power before that happened.
At the same time, the 10-wheelers run much faster than the moguls – so trimming their top speed a little more severely helps keep their speed within reason on my layout.
It was a simple fix and I feel more relaxed about running the layout knowing there will be no Silver Streak incidents…