Administration does not usually mean immediate stopping of all work / loss of staff. Companies can continue to operate whilst the administrator searches for a buyer of all or part/s of the business. Given that there ought to be a future for the Martson Vale units (there is no alternative except the rubber tyred one) that should give hope that that part will be bought by someone, thus the Bletchley based maintenance staff could be retained.
Administrators do have to work under strict rules re costs incurred after appointment but this is, at the moment, administration rather than liquidiation - which is what happens when you accept there will be no buyers, that any further money spent is wasted, thus the administrator stops spending it immediately.
Seems a bit strange to me. Suggesting to me that the Marston Vale service will not be operated by the Vivarail units again.