How to use the online alarm clock
Handing over responsibility at 10:12 pm, you can use the alarm as the point when the next person checks the schedule for overnight engineering works on the Underground. It gives the changeover a precise moment instead of leaving the check somewhere in a spoken briefing, with enough time to resolve a missing detail before 11:00 pm.
A schedule check can easily disappear beneath conversation, station announcements or equipment running nearby, so the alarm needs to be clearly audible at the place where the handover happens. The chosen volume may seem adequate in a quiet test yet become hard to hear once background noise rises. If the browser page is closed or the phone or laptop goes to sleep, no signal can sound, so the engineering works schedule may go unchecked. Keeping the screen active and testing the tone amid the actual surroundings makes that risk easier to judge.
As the evening shift settles, some areas grow quieter while control rooms, depots and staff spaces can remain busy. A practical handover note records who will respond at 10:12 pm and where they should be when the alarm sounds. Placing them away from the loudest machinery, with the schedule already open, reduces the chance that a late burst of noise masks the cue.
Common questions
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
What happens if my laptop goes to sleep before 10:12 pm?
The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
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