"Clive D. W. Feather" wrote in message

In article , Recliner
writes
What about Blake Hall, North Weald and Ongar did they used to use
only one platform?
Now those really were little-used stations, and not the only ones to
have but a single operational platform. But none of them were one-way
like T4.

Well, trains only left in one direction (ditto for Mill Hill East).
But they reverse, so it's not one way.

Tramlink has several one-way stations.
Yes, agreed, on the central Croydon loop line.