As for people claiming they need it for expenses , an itemised receipt should do the job here . I dont get how actually submitting tickets proves you made the journey and paid for those tickets . Whats to say you didn't just pick a couple of tickets up off the floor at a station or on a train .
Receipts from the ticket machines are no good, the ones on SWT just simply say a ticket with the amount, with no further detail on journeys. Accounts departments can be rather picky at times, and having to spend ages queuing up to get a proper receipt from a man behind the glass is a pain just to get the journey/ticket type on the receipt.
I assume you are being facetious when saying why not pick some tickets up off the floor ... if you submit a load of expenses for tickets that have no relevance to where you're travelling from/to on your defined expenses then of course accounts will pick up or you won't get paid when they are cross-checked. Have you ever had to claim on expenses?
Then again, let's flip that round and using the example of my SWT receipt from the ticket machine, how can I prove that I have made journey x and bought the ticket that I have required in line with expenses policy if the receipt is so vague?
Why not just do as other countries do and just endorse the ticket when you exit the transit system (if, say it is a single)?
Problem solved - the ticket collectors of the world can rejoice, and those that need to keep tickets to claim expenses can do so.