Watching them at Kings Cross/ St Pancras Northern Line southbound at 9am on far too many mornings, they stand in the centre of the platform with strategic view of the platform edge.
They have a microphone giving them access to the platform public address system and they have many things to say:
The next train to arrive in 3 minutes is the southbound northern line train to Mordon via Bank.
Please move down the platform.
The next train to arrive in 2 minutes is the southbound northern line train to Mordon via Bank.
Please move down the platform. there is plenty of room at the other end of the platform.
Please stand behind the yellow line a train is approaching.
PLEASE STAND BEHIND THE YELLOW LINE A TRAIN IS APPROACHING.
Please allow customer to exit first.
PLEASE ALLOW CUSTOMER TO EXIT BEFORE GETTING ON THE TRAIN.
There is another train behind this one arriving in two minutes.
PLEASE ALLOW CUSTOMERS TO EXIT BEFORE GETTING ON THE TRAIN
The train is ready to depart, please stand clear of the doors.
THE TRAIN IS READY TO DEPART PLEASE STAND CLEAR OF THE DOORS
PLEASE STAND CLEAR OF THE DOORS, THE TRAIN IS READY TO DEPART
The next train to arrive in 1 minute is the southbound northern line train to Mordon via Bank.
Please move down the platform.
The next train to arrive in less that one minute is the southbound northern line train to Mordon via Bank.
Please move down the platform. there is plenty of room at the other end of the platform.
Please stand behind the yellow line a train is approaching.
PLEASE STAND BEHIND THE YELLOW LINE A TRAIN IS APPROACHING.
Please allow customers to exit first.
PLEASE ALLOW CUSTOMERS TO EXIT BEFORE GETTING ON THE TRAIN.
There is another train behind this one in two minutes.
PLEASE ALLOW CUSTOMERS TO EXIT BEFORE GETTING ON THE TRAIN
The train is ready to depart, please stand clear of the doors.
THE TRAIN IS READY TO DEPART PLEASE STAND CLEAR OF THE DOORS
PLEASE STAND CLEAR OF THE DOORS, THE TRAIN IS READY TO DEPART
They also give the all clear to the driver. From their position they can see it all. They also have a walkie talkie which allows them to talk to the control room.