Over the past few years I have upgraded quite a few engines with the ERR system. I have noticed that they seem to be more sensitive to stalling at slow speeds compared to PS2, PS3, and Lionel Legacy which never stalls. I always make sure that the wheels and the pick-ups on the engines are clean before running. Has anybody else experienced this also or am I doing something wrong. Thanks
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I'm not sure what you're saying here, but I've never noticed anything like this with ERR upgrades, and I've done a ton of them.
I will tell you one thing about many command upgrades, they're typically done to older locomotives with fewer and less optimally placed track pickups, this sometimes results in problems operationally. This is not the fault of the ERR hardware, but rather limitations of your specific locomotive. I routinely add a single-wire tether on steamers to share the pickup rollers on the tender with the locomotive to eliminate these issues. I've also been known to add a pickup roller to tenders that don't have them for the same reason.
Gunrunnerjohn,
Thanks for the answer I am going to try to wire a dummy unit to the powered unit so that i have more pickups. I am going to use a connector so that I can connect different dummy units to the powered unit so I always won't have to use the same combination of engines together.
You might also add additional wheel/axle pickups, or add a wire from the tender chassis to AC ground on the cruise commander. You can add wires from the tender truck frames to the tender chassis frame and then from there to AC common on the cruise Commander board.
Sometimes the loco will stop if the outside rail connection is flaky.
After reading these posts I experimented by wiring the power and ground from a non-powered (dummy) unit to the powered unit that contained the ERR upgrade. I cleaned all of the pick up wheels and rollers on both the dummy and the powered unit. The result was amazing. I was able to run at a slow speed without stalling that would rival any PS3 or Lionel Legacy engine. I thank you guys for your advice.
Like magic. 
MU'ing powered/dummy engines for switching operations is the only way to go.
I used R/C airplane cables for my MU cables. The MU cables are for (heavy cables) center rail power pickup, motor + and -, The smaller cables are for dummy front lights, electric coupler in the front of the slug unit and the outside rail ground. My "dummy" slug has one powered truck. The ERR commander is in the GP7u, so I can run it without the slug. Plan to add MU cables to other engines so to use the slug with other engines.
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