I think I'd start by examining the wiring and then testing the boards. Cruise is not mentioned, but as George says, that's not a concrete indication of what you have. However, I don't think any of the K-Line stuff from 2002 came with cruise control, that came several years later as I recall.
K3790-4015S Union Pacific Big Boy #4015 w/Lionel RailSounds, TMCC, Smoke & Electrocoupler