For the issue with the gateline between the DLR platforms & Liz Line platforms at Custom House, could it be resolved by changing the readers on the gates to be pink rather than yellow? Pink to 'confirm' route for any passengers coming from the DLR platforms so they don't get charged a max fare for an incomplete journey and to allow a new journey to start for anybody arriving without having previously touched in?
I would agree that it doesn’t need any validators but could simply be accomplished by some technical changes to the system.They would really have to be set up as equivalent to 'continuation exit' readers, which you see at certain stations. But I'm not sure this can be done for barriers.
It was done for many years at Stratford, where the Jubilee line had its own gateline, inside the gateline for the main station, so any customer using the Jubilee line would need to pass through the gateline if they were interchanging from any other line (and touch in/out twice in succession on two separate gatelines if entering from the street).
Similarly, when NR had gatelines on the platforms at Finsbury Park, albeit not initially, the station was set up in a similar way, to effectively ignore intermediate taps. For instance a customer could touch in on the LU gateline, and would then touch a second time on the NR gateline. IIRC when the NR barriers at platform level were initially installed by FCC, you used to have to touch out on the LU passenger validators and then touch back in again on the FCC barriers, or out on the barriers and back in again in the other direction.
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