How to use the online alarm clock
Preparing now to release the relief crew onto the railway tracks gives you time to check the access window, confirm who is ready and set the alarm for 12:42 am. That leaves a useful margin before 1:00 am for any final communication with the signaller, without treating the round hour as the actual departure point.
Because the track team depends on a precise handover, test the alarm signal while there is still time to change the volume or sound. Set a temporary alarm a minute or two ahead, confirm that it is clearly audible, then restore 12:42 am and check the displayed time once more. Closing this page or allowing the computer to sleep means the railway-track release will receive no alarm from it, so retain the control room’s usual backup alert.
A night railway handover can disturb people elsewhere in the house if the alarm carries through thin walls or along the landing. Keep the computer close enough to hear at a moderate level, choose a distinct tone rather than maximum volume, and close the room door beforehand. If someone is sleeping nearby, a vibrating watch or phone backup can provide a quieter second signal at 12:42 am.
Common questions
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 12:42 am?
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.
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.
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