Personal belief regardless of any instructions from these 2-bit companies...
Unless dispatched,
At :40 - 20 seconds before dep time close doors.
Gives you few more seconds to shout runners on, or to hang on for anyone who looks like they are making an effort. Let them close for the plonks who assume we will wait while they amble slowly along.
At :55 Buzz buzz to driver.
At :00 ish, driver should take power (assuming he's there/not in coffee shop/awake).
Cheeky wotsit!!
:20 Train should clear platform.
Ah, don't you love these "ideal world" scenarios...?
I got abused last weekend. I'd stopped, done my station duties and started to shut the doors (on time at XX:XX:55, as is my custom). As the warbles sounded three people appeared on the platform. I shouted at them to board quickly and gave another door release. Two of them ran but the third didn't, so I assumed that she didn't want my train and shut up again. Just as I got interlock she ambled over to me and asked
"Are you really closing the doors?". I said yes and told her the next train would be in 15 minutes. Some geezer on the platform had seen and heard all this and, because she was young and pretty, started yelling the odds and telling me that I was
"...taking a f***ing liberty" and
"...out of order" and
"...a f***ing c***".
And this is the problem. You can aim to dispatch at a certain time in order to preserve your timekeeping, but things do happen from time to time that will prevent it. I'm sure that, like me, every guard/dispatcher/DOO driver has a system to ensure on-time departures, but with the best will in the world you're fighting a losing battle.
Consequently you can understand why some TOCs try and get the doors closed as soon as possible. It builds in a contingency and allows the train to leave bang on time no matter what happens. That said, I can understand why closing up early can be a problem. If you've arrived in time for a train and it's still there, it must be frustrating not to be able to board.
Early departures, however, are rare. I've never been given the right away more than a handful of seconds early except for one time at Stansted Airport when the fire alarms went off. When that happens it is policy to clear the station, so I was sent out almost immediately and had to wait time further along the line.
O L Leigh