Question: The common stored value ticket was replaced by a contactless smart card that lead to the development of what in London?
Sentence (from "Octopus card"): Launched in September 1997 to collect fares for the territory's mass transit system, the Octopus card system is the second contactless smart card system in the world, after the Korean Upass, and has since grown into a widely used payment system for all public transport in Hong Kong, leading to the development of Oyster Card in London.
Relevant evidence: Yes