MrJeeves
Established Member
When tickets (A-B) are routed as "via X", you are permitted to calculate permitted routes from A to X and X to B and combine them to find additional valid routes. This isn't mentioned in the routeing guide, but is done by journey planners and was confirmed by RDG (ATOC then) when they were asked previously.
See: https://www.railforums.co.uk/thread...-guide-section-3-routeing.70716/#post-1192129
My question is whether, if you use this rule, do you need to consider doublebacks when merging the two routes together?
Consider a ticket from Portsmouth Stations to Ashford Intl, route Edenbridge/Polegate.
We can split the routeing for this into Portsmouth - Edenbridge Stns and Edenbridge Stns - Ashford.
Permitted route from Portsmouth to Edenbridge (r.p. Redhill) could be Portsmouth - Havant - Ford - Horsham - Three Bridges - Gatwick Airport - Redhill, then local journey to Edenbridge.
Permitted route from Edenbridge to Ashford Intl. could be (LB+DE) local journey to Redhill, up to Victoria, then across and down to Ashford with Southeastern.
This would comply with the via Edenbridge routeing, but would have a double back (Redhill - Edenbridge - Redhill).
What do people think about this (in a theoretical sense)?
Edit: this was a terrible example as Edenbridge - Ashford's appropriate routeing point is actually Tonbridge of course, but the overall question still stands.
See: https://www.railforums.co.uk/thread...-guide-section-3-routeing.70716/#post-1192129
In addition to the permitted routes which involve travel via this location, permitted routes also include all permitted routes from the origin to the via point, and from via point to the destination. This was confirmed by ATOC when a customer enquired about a Sheffield to Blackburn ticket routed via Burnley.
My question is whether, if you use this rule, do you need to consider doublebacks when merging the two routes together?
Consider a ticket from Portsmouth Stations to Ashford Intl, route Edenbridge/Polegate.
We can split the routeing for this into Portsmouth - Edenbridge Stns and Edenbridge Stns - Ashford.
Permitted route from Portsmouth to Edenbridge (r.p. Redhill) could be Portsmouth - Havant - Ford - Horsham - Three Bridges - Gatwick Airport - Redhill, then local journey to Edenbridge.
Permitted route from Edenbridge to Ashford Intl. could be (LB+DE) local journey to Redhill, up to Victoria, then across and down to Ashford with Southeastern.
This would comply with the via Edenbridge routeing, but would have a double back (Redhill - Edenbridge - Redhill).
What do people think about this (in a theoretical sense)?
Edit: this was a terrible example as Edenbridge - Ashford's appropriate routeing point is actually Tonbridge of course, but the overall question still stands.
Last edited: