While that works for I'd think anything else, surely Kentish Town wouldn't work, due to the doubleback into St Pancras?
Online journey planners will offer this as a valid route; the average passenger doesn't need to know the detail of why this is the case, but for anyone who is wondering, in this particular case the online journey planners need to check if this is a mapped route in the routeing guide (
http://data.atoc.org/routeing-guide ).
The origin is Leeds; Leeds is a routeing point itself (or, to be precise, Leeds is a member of the LEEDS GROUP). So the origin routeing point (ORP) is Leeds Group.
London Group passes the fares check for a Leeds to Kentish Town journey, so London Group is an
appropriate destination routeing point (DRP) for this particularjourney.
The map combinations between the ORP (Leeds Group) and DRP (London Group) include, among others, maps
SY+DO.
Leeds - Sheffield - Leicester - London St Pancras is a perfectly valid route under map SY+DO.
There is no doubling back on the maps!
If the destination happens to be
passed through on the maps, that is no issue at all.
See:
https://www.railforums.co.uk/threads/mythbusting-doubling-back.159671/
