the long run
Have you ever been to Ely station? If you have, you've probably encountered their alternative to a pedestrian bridge - a long, curved subway linking Platform 1 with Platforms 2 and 3. It may be wheelchair- and pushchair-friendly, but it's a long haul when you're carrying heavy bags and your connection's about to leave.
Of course, this has been slightly tweaked to emphasise the difficulty :-)