"With the constant (and unsustainable) attention of staff, and three weeks of practice, they eventually became a little more docile [...] It’s like child psychology [...] So if you can’t tell them what to do every two minutes, how on earth do you get them to comply? [...] The handrail and tread of the escalator will be a different colour, and firmly planted pairs of feet will decorate the left of the steps."

I wonder if they have tried to simply explain to commuters why it makes sense to stand on both sides. Treating people like intelligent and responsible adults often works much better than treating them like intellectually disabled children.