How to use the online alarm clock
Halfway through supervising the job, you need a firm interruption at 1:37 am so you can break away and release the relief crew onto the railway tracks. Setting the alarm for that exact time gives you a clear handover point, while 2:00 am remains a useful boundary for checking that the changeover is complete.
With railway work still occupying your attention, the alarm sound needs to come from the place you expect. Connected headphones can quietly take over the audio output, leaving the computer itself silent, so the selected sound and current output are worth checking before you return to the task. If this browser page is closed or the computer goes to sleep, no alarm will sound to release the crew onto the tracks; a separate alarm is sensible when the handover cannot be missed.
Once the relief crew has gone out, leave a defined buffer before the next duty rather than filling every remaining minute. At this point in the night, the 23 minutes before 2:00 am can cover a brief record of the handover, equipment notes and a check of what follows, while still preserving a few minutes for an unexpected query.
Common questions
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
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.
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