Red (or generally any bright colour) usually means an amendment to the diagram, against the normal one.
If Pilning was an extra stop compared to the norm, it would probably be printed in colour (where colour printers are used, of course, bearing in mind many schedule cards are printed on laser printers which might just manage grayscale).
Would you expect an extra payment to drive an electric train instead of a diesel train?
Why should a tablet superseding paper be any different?
Not an equal comparison.
With a tablet I would be responsible for charging it and updating it. Also I would need to carry it everywhere and potentially have to check it for emails and would in effect always be contactable.
It also saves the company money not producing said publications on paper - so why should they be the only ones to benefit from an increase in work from me?