please empty your brain below

The thing about all TfL nannying is, it’s very hackneyed.
It might be interesting to submit a Freedom of Information request relating to the 'Time Before Disappearing' sign parameters for stations on your favourite Underground, DLR or Overground line...
I think TfL have taken a "worst case" approach here. If you are dragging a buggy, children / luggage or are not especially fit then it will take much longer. Given you, DG, can readily walk 10 miles without a second thought it's no wonder you can make the connection between platforms in such good time. Those of us (of the same age) who are not as fit or speedy as you could not achieve your times. If you are 70+ and walking with a stick then you're going to be vastly slower.

I agree the removal of train times seems rather odd but in this era of "inclusion" and "accident reduction" I can understand the mindset that resulted in this outcome.
I didn't walk the passageway particularly fast. A couple of people overtook me. Also, you'll see I rounded up my time from two and a half minutes to three.

I doubt it's the buggy-pushers, luggage-tuggers and stick-wielders TfL are worried about here - it's the potential athletes, who could easily run it in two.
London Bridge has indicators in the concourse that disappear about a minute early. However, trains are both frequent and frequently delayed at London Bridge, so it is not uncommon to read the board in the concourse, see there is a train due NOW, get up to the platform and jump on it, only to discover you've boarded a train that should have left for an entirely different location several minutes earlier.
A gap of nine minutes does sound very conservative.

If the nine-minute cut-off might omit four trains, does that mean there is one every two or three minutes? Sounds like "turn up and go" to me. What is the aveage gap between services here?

dg writes: There are four platforms.

If the runners know the board is lying to them, might they just run anyway (particularly if they are equiped with Citymapper or similar)?
Depending on how clever the sign is (e.g. colour or monochrome, dot matrix or full video), the answers must surely be:-

(1) Delete it if you can't reach it at average walking speed, so nobody runs.

(2) Show it in italic, subdued colour or lower case if you can reach it at average walking speed.

(3) Show it in bold, bright colour or UPPER CASE if you can catch it even at slow walking speed.
re-name them 'Next Train that we calculate the averagely-abled, unencumbered person travelling at average pace under normal conditions could probably arrive at the platform in time to board Indicators'
There is surely no need to remove a departure from the screen because a particular individual's circumstances mean they would not reach the platform in time; that's for them to decide. It seems more likely to be to stop people dashing for trains, but once most people cotton on those who dash will just dash anyway in case there is a train about to leave but not shown.

I've already been caught out at Northwick Park - indicator at bottom of stairs says no train for 10 minutes, so I queue for a sticky bun from the kiosk, have a brief chat, stroll up to the platform and see the train before just pulling out.
Why don't the boards give the actual time (like 9.45 or 12.22)that the train is expected to arrive? You could then look at your watch/phone and decide whether you had time to reach the platform.
At East Croydon on the ramps down to the platforms they were concerned at the number of injuries caused by people running for trains. So they replaced the nice expensive smooth floor tiles that they had then recently laid for a brick surface.

When that wasn't effective enough they plastered the place with 'don't run' messages.

After that they decided to make it impossible to see if a train was in the platform to reduce the incentive to run - until the very last moment. They did this by covering the glass walls (expensively installed to jut out and replace the original walls to make the ramp wider) with a translucent mural. Oh, and by the way, they have installed handrails that are located a fair distance from the walls thus making usable portion of the ramp narrower than it has ever been before.

All this might reduce injury and be a good thing but this needs to be offset against the fact that many services are only half-hourly and hours of people's lives are wasted because they didn't realise they could catch their train if they hurried up a bit - even though it wasn't displayed on the departure boards in the ticket office.
@POP, that's why I try to use the north entrance to East Croydon.
This happened at Fairlop (a tiny station) yesterday. By the gates, the eastbound to Hainault was 10 minutes away. I was like 'oh what a faff'. Went upstairs which must have taken 20 seconds, and there next train indicator had a train for 1 minute. Managed to walk 2/3 of the platform before it arrived.
Several posters are lamenting the nannying aspect of the removal of trains from train indicators, but perhaps they are under-appreciating how they personally benefit from this.

Last weekend I visited Bethnal Green tube station to see the recently erected memorial to the 172 people crushed to death on the stairs at the station entrance one evening in 1943. dg has visited: https://diamondgeezer.blogspot.co.uk/2017/12/stairway-to-heaven.html

Mass crowd fatalities such as the one at Bethnal Green have three classic factors:
1. Physical configuration: a downward slope (e.g stairs), without space for people to disperse.
2. A sudden sense of ugency in a crowd. For Bethnal Green this was a new anti-aircraft gun starting to fire, an unfamiliar sound which the crowd interpreted as bombs dropping.
3. A sudden disruption in the flow of people. One person trips over. Or a door doesn't open fully. Or even just a turn in the corridor.

Without these three factors occuring simultaneously, crowds usually self-manage quite effectively, for instance by slowing down, stepping around an obstruction, communicating the cause of the disruption. So luckily not every disruption results in consequences as extreme as the Bethnal Green incident. But one disruption can still have consequences that spread out to affect a large number of people. I think TFL's aim is not simply to reduce injuries. It is also to maintain flow in their transport system, for the convenience of everybody. One person collapsed in a corridor may need the attention of paramedics, who may be a further obstacle to movement in that corridor, with the knock on effect of slowing thousands of travellers trying to use that corridor. This may cause tailbacks into parts of the station that slow down passengers whose route doesn't even include the corridor with the collapsed person. If the staff are now busy managing the crowd, trains may be no longer be dispatched on time, allowing the disruption to spread further into the network.

The manipulation of information on train indicators seems to me to be an attempt at crowd control. As passenger numbers increase in London, the chances of disruption and the consequences of disruption both increase. There are physical bottlenecks in many stations (Factor 1 above) that would need a lot of time and financial investment to alleviate. So the crowd control measures currently focus on alleviating Factors 2 and 3. Removing information about soon-to-arrive trains aims to reduce Factor 2, the sense of urgency in the crowd. And this in turn helps to reduce Factor 3, at least in terms of making it less likely that a hurrying person falls or knocks over someone else.

A smooth-running transport system benefits an enormous number of people.
(deep breath)

AND YET AT NUMEROUS OTHER BUSIER STATIONS THE CORRECT TIMES ARE SHOWN AND NO SIGNIFICANT INJURIES OCCUR.

WHY IS THIS RULE APPLIED SO INCONSISTENTLY?
@ JonathanC

The Bethnal Green tragedy happened in a wartime blackout. The staircase was illuminated by just one screened 25W bulb. The wide staircase was missing a central handrail. People were running for their lives.

These conditions would not all combine today, and can't justify the extreme caution seen at some stations but not others. It's as daft as Please Hold Tight, The Bus Is About To Move nonsense at every stop which has thankfully now been scrapped.
The difference in time cut-off between the two directions is because you need to go up a flight of stairs from Central to Downs, but down it the other way. They're obviously more worried about people running up the stairs and dying of a heart attack than running down them and falling over.
There is (or was when I was last there a few months ago) the opposite problem at Paddington. The trains to Ealing, Hayes etc are only displayed a couple of minutes before they leave, so everyone has to sprint quite a long way to platforms 10-13.










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