"Passenger Service Agents" are on some, not all trains. And on about a third of the trains they are on, they are manually operating the train at full speed (gen

"Passenger Service Agents" are on some, not all trains. And on about a third of the trains they are on, they are manually operating the train at full speed (generally for "diagnostic" (read as sanctioned joyriding) purposes, I am informed by a friend at TFL).