Nearly all Steam Locomotive moves made not in passenger service will be accompanied by the Support Coach, also know as the POB (Private Owner Brake), which often has a little kitchenette area for hot drinks/food when on the move, is used by the support crew accompanying the loco for the journey (including overnight if needed, although driving crew get hotels I think), and sometimes has a store of tools (and even parts) to help service the loco when away from base. Sometimes it can be outstabled at sidings with basic or no facilities. It also can function as the brake vehicle for the main tour formation if needed for length saving/passenger capacity reasons.
The accompaniment of the Support Coach is why 'light' steam loco moves are usually classified as Class 5 schedules rather than Class 0. It is possible for Steam locos to run without one as a Class 0 schedule, but it's rare to do so for more than a fairly loco trip (e.g. for Coal or turning).