They say you cant use it on there, but its been posted a few people have used Southern only tickets with no problem, or have had the money they paid for a new ticket refunded.
Probably easier to use normal Southern services.
Gatwick Express is a Southern route, the trains are operated by Southern.
The NRCoC states:
National Rail Conditions of Carriage said:
10. Tickets valid only in trains of particular Train Companies
The validity of a ticket may:
a) be restricted to; or
b) prohibit
travel in the trains of a particular Train Company or Train Companies. Any such
restriction or prohibition will be shown on the ticket. If you travel in a train with a
ticket that is not valid, the relevant parts of Condition 2 or 4 will apply. If you are
unable to use a ticket or any part of it, you may be able to claim a refund under
Condition 26 or Condition 36.
So, if a ticket is marked "Southern Only", it is restricted to travel in the trains of that Company. It is not valid on trains operated by other Companies.
Is Gatwick Express a company? A search at Companies House reveals that the company of this name has been defunct since the new integrated Southern franchise in 2008.
Some staff do claim that Gatwick Express is a separate company, and that the "umbrella company" is Go-Ahead and Gatwick Express is one of their companies, so let's check shall we?
http://www.govia.info/doc/findoutmore/index.html "f you have any questions or feedback for us, please
contact us or email our train operating companies as follows: Southeastern, Southern, London Midland"
If Gatwick Express was a separate company, it would appear as a think black line as "other operator route" on the Southern map. If it's merely a Southern route, it will appear as a red line with the key saying "Gatwick Express route", right? So, let's look at the map and see:
http://www.southernrailway.com/images/network_map_full.jpg Ah, as I thought, it's shown there as part of the Southern network.
But let's not stop there. Ultimately the railway is regulated by the Department for Transport, ultimately it's their decision. Fortunately, someone has already
asked if Stansted Express and Gatwick Express are TOCs. The relevant question is: "* Can you confirm whether Gatwick Express and Stansted Express are separate companies, as defined in Appendix A of the NRCoC?" and the answer from the DfT is: "I confirm that neither Stansted Express nor Gatwick Express are a Train Operating Company: Stansted Express is a trading name of the London Eastern Railway Limited Train Operating Company. Gatwick Express is a trading name of the Southern Railway Limited Train Operating Company."
Southern cannot go against the DfT. The DfT has specified an integrated franchise, this franchise requires the Gatwick Express route trains to have different branding but it does require the trains to be operated by the franchisee, Southern.
The Gatwick Express website states "©
Gatwick Express is operated by
Southern."
I know the media don't always get it right but this BBC article is correct:
http://www.bbc.co.uk/news/uk-england-14292920 furthermore, we could go to the ASA with a further case against Southern if they deny operating these trains.
It is true that 2 members of this forum were charged excess fares (calculated as the difference between a Southern Only single and an Any Permitted single) by staff who denied that the trains were operated by Southern, however in both cases members of this forum assisted the customers in obtaining a full refund (and more). In addition there are a double-figure number of customers who have told me that their Southern Only tickets were accepted when they brought a copy of the Southern route map and pointed out that the Gatwick Express is a Southern operated route.
Therefore, past history tells us that the OP is more likely to be allowed travel than be charged, but if the OP is charged, we we will certainly assist in writing a third letter requesting a full refund (plus a bit more for the inconvenience). London Travelwatch also have promised to assist us if Southern do not issue a full refund and someone very high-up at London Travelwatch is aware of this and we will not hesitate to contact him if there isn't an immediate refund for anyone who has been charged an excess.