Why taken on a train at all?
Why are any working documents taken out of the office? Why should anyone be allowed to work on official business outside their office unless under an official agreement to work from home, as part of their normal working day? Working outside normal times and place of work is usually a sign of inefficiency, bad planning or gross overwork suggesting that staffing is inadequate, badly managed or the staff themselves are inadequate.
If documents must go from one place to another and are too valuable for normal post or even internal post, then use a courier service with full traceability or even, catching up to the late 20th century, encrypted computer file transfer or encrypted email.
Seems to me that management, human resources and the idiot taking papers, CDs or whatever off site all need a stiff review. Who can not be aware of the possibility of car-breakins, house burglaries, accidents, simple theft or human error?
As for this mania for passing all and sundry to the media, as if every media employee was above suspicion: money- or attention- seeking is the only reason I can imagine, or am I just too aware of my responsibilities as well as my rights? The media! After all the lies, betrayal and distortions spread via that wonderful business in the name of money.
Police: a society gets the police force it deserves, or so they say; government too perhaps.