Union Pacific Ballest Train questions

I just resently purchased a Roundhouse Models Company UP Ballast
Hopper
the Car has NO Road Number and most of the ppl @ Nor Cal UP know VERY
LITTLE About The Ballast Hopper Fleet
1. Would like to know what kind of power Might be used in this manner
of Servise?
2. What are the Roadnumbers for the ballast fleet? and did they have
Road Numbers on the side
I'M modeling the Kentucky Dam Aera in HO (tracks are owned by the
Paducah & Louisville Ry.)
the plan is for a 10'x 9' around the wall layout and the main town is
Calvert City
It will have both the Calvert City Terminal and the Volcan Interprizes
transfer fasality
Ballast is transfered from barge to train @ the CCT.:-)