How to use the online alarm clock
Break away from the job in hand at 4:30 am to release the relief crew onto the railway tracks. This alarm marks the point to stop what you are doing, confirm that the authorised access is ready and hand the route over safely. The half-hour before 5:00 am leaves room for the crew to reach their work site without treating the round hour as the actual release time.
Because the signal must work at a precise point in the shift, check it well before anyone depends on it. Set 4:30 am, confirm the displayed time and volume, then run a brief test while there is still time to correct the sound settings. The railway crew will not receive their release cue from this browser alarm if the computer has gone to sleep or the browser session has ended, so keep the alarm running and use the railway’s established backup procedure as well.
Once the crew has gone onto the tracks, make the remaining night’s sleep easier to return to by preparing the handover before the alarm sounds. Keep boots, radio and paperwork together, and use a low light for the final checks rather than lighting the whole room. After the 4:30 am interruption, silence any unnecessary notifications and note the next required wake-up separately, so the rest period is not spent wondering whether another duty is due.
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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