none of the 6V systems had a ballast resistor, it didn't start until trucks were all 12V, 2nd series 55s

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics