Martin,
I'll check my emails to Jim King, but here's a general statement his website says about his S-scale models:
Each kit includes 1-pc urethane underframe and details, steel weight (hidden in centersill during assembly), laser-cut deck & bulkheads (where applicable), wire, decals and Kadee 802 couplers. Trucks are not included.
Hopefully the O-scale offerings will be the same.