Tube · Elizabeth line · DLR — measured every 30 seconds
Good Service is a declaration.
This is a measurement.
TfL’s status is set by hand and lags what is happening on the platform. Delayometer watches the gaps between trains and the time they take between stations, compares both against what is normal for this line at this time on this kind of day, and tells you how much longer your journey is taking.
Where we disagree with TfL
TfL is reporting a good service on a line where journeys are taking longer than usual:
- the Waterloo & City line — about 6 minutes longer
TfL is reporting problems on the Central line and the Victoria line. Across the line as a whole we are not measuring any extra journey time — but that does not clear your particular route. If their warning covers the stretch you use, theirs is the one that matters.
Right now
Generated 17:52:03 London time
How a delay becomes a number
Full method →01
Watch every train
Every 30 seconds we take TfL’s live arrival predictions for all 13 lines — tens of thousands of them a day — and record them exactly as they came, before deriving anything.
02
Two independent signals
How long you wait on the platform, and how long the train then takes between stations. A line can fail either way, and the two together are what separate “crowded but moving” from “stopped”.
03
Compare against normal
Normal is built from weeks of measurements for that place and that quarter-hour, with officially disrupted periods left out — otherwise chronic disruption quietly becomes the new normal and stops being reported.
04
Say what we do not know
A section nobody has been measured across is grey and says Measuring. It is never green. Green is a claim, and we only make it when we have the data to back it.
The app
The whole network in your pocket,
for less than a single fare.
Delayometer is coming to iPhone: measured status for every line, the sections of your line that are actually slow, and the last 24 hours you can scrub through. No account, no ads, and nothing about you leaves your phone — there is nothing to leave, because we never ask.