Ted,
I ordered two NS SD-60's from the 2002 catalog. I was wanting to "MU" them. It will never happen as these units don't have a Odyssey On & Off switch and fight each other.
If a motor driver or motor encoder ever goes bad in one or the other, they will both be upgraded to a ERR Cruise "M". Them I will "MU" them. I will say they each are excellent runners using a Cab2.
Bill