1) Apprentice 2) Army cadet 3) Beginner 4) Boot camp denizen 5) Boot camp participant 6) Cadet 7) Checkout line lengthener 8) Early worker 9) Entry-level employee 10) Indoctrination subject 11) Initiate 12) Intern 13) Just-hired one 14) Learner 15) Many a new hire 16) Neophyte 17) New hand on deck 18) New hire 1) Apprentice 2) Beginner 3) Cadet 4) Intern 5) Learner 6) Novice 7) Plebe 8) Pupil 9) Student 10) Tyro 
An employee participating in a company-sponsored training program. 
An employee that is new on the job and has gotten out of railroad school.
[n] - someone who is being trained
noun someone who is being trained