Lots of discussion relative to pulling power of current modern engines. Specifically, the inability of the motor to spin the wheels when it is under load. It seems that this is more prevalent in DCC than DC.
The significance of this is the motor voltage level. In DC the voltage could be as high as 16 volts. In DCC it will peak at just under 12 volts. That is at least a twenty five percent difference in input power. That is likely the issue.
The complaints seem to be getting more vocal. Enough that A review of my testing process is needed. So far, the max draw bar load has only been identified at 16 volts. At that level all but one engine has been able to slip its wheels.
The testing needs to include the max load draw bar testing at 12 and possibly 11 volts. In particular the wheel slip needs to be noted along with the max load at the selected voltages. Perhaps the voltage needs to be reduced by increments until the wheels no longer slip at the maximum load, thus the motor stalls.
I find the potential of this to be of concern. Motor stall in DCC puts the motor at stall current for the voltage. This has to be a bad condition for motor life if that is occurring at or near 12 volts.
Because of this, the testing for selected modern engines from my collection will be tested in the near term. This was going to happen after the completion of the entire test track, but getting this data sooner rather than later is important.