The barriers will open as the "touched in" status of a contactless card/device isn't available to barriers in live time - tap data usually takes 5-15 mins to propagate into the system so it wouldn't necessarily know if you've just touched in at Stratford. However, they'll be charged a maximum fare for an incomplete journey afterwards.On Greater Anglia, I'm surprised to see they haven't included the Wickford to Southminster line which branches off the Southend Victoria line.
Quite a few journeys are made between stations on both branches so I was expecting both lines to be included at the same time.
I hope people don't tap in (even though it won't work) using the existing smart card readers on the Southminster line then get penalty fared either at Liverpool Street or Southend (or on the train), when the barriers don't open.
Also, as mentioned above, could this create anomalies where for example a paper ticket from Battlesbridge, the first stop on the Southminster line is cheaper / more flexible than a contactless payment at Wickford? (Sorry - even I'm now lost with how these things all work).
It could be cheaper, but probably only at times when the current Super Off-Peak ticket is valid, or at times when the new evening peak restrictions apply (these will be added to the Off-Peak fares).