Trainline shares tumble amid warnings over expansion of London contactless zone

Ticket website also faces uncertainty over hit to foreign travel and government plan for UK rail booking system

The online rail ticket retailer Trainline has warned of headwinds", including the expansion of London's contactless travel zone and economic uncertainty denting foreign travel.

Shares in the London-listed company tumbled by as much as 8% on Wednesday, before recovering slightly to a fall of 4%, despite reporting surging profits for the year to 28 February.