goOffShift

Takes this transporter off shift: it cannot be allocated again until goOnShift, and requests for it wait in whatever pool queue they were made against.

It stays where it is and keeps the space it occupies. A transporter off shift is not gone from the guide path; it is a vehicle standing in an aisle, which is what a real one parked at the end of a shift is, and the blocking that follows is a fact about the layout rather than an artefact. Park it somewhere out of the way first, with sendTo, if that is what the site does.