Liberal Democrats on the London Assembly are seeking assurances that Oyster users will have access to the new part-time travel card when it launches early next year.
In January Mayor Boris Johnson ordered Transport for London to draw up plans for a new ticket which offers savings to part-time workers and those who work from home for some of the week.
Introduction of the pass follows lobbying from Liberal Democrat and Conservative Assembly members who say part-time commuters deserve access to the same savings those who travel every day enjoy.
Assembly member Caroline Pidgeon has written to the Mayor asking him to confirm the new pass will be available to both Oyster and contactless card.
Her letter follows the introduction of weekly fare capping for contactless credit and debit card users before the Oyster system can support the feature.
Ms Pidgeon says that decision breaks the Mayor’s past promises that Oyster would always offer the cheapest fares and that those who are unable to have a contactless card will not be disadvantaged.
In her letter, Pidgeon says: “as users of Oyster are now being denied a cheapest fare package that is now available to users of contactless payment I would also welcome an assurance that the introduction of a part-time travelcard will be accessible on a totally equal basis for both users of contactless payment and Oyster.”
The Mayor’s office have been asked to respond.