How to use the online alarm clock
While you wait to check the timetable for overnight engineering works on the Underground, a 7:07 pm alarm marks the assigned moment without constant clock-watching. It also leaves a useful stretch before 8:00 pm for confirming affected lines, replacement buses and the first services expected after the work finishes.
This reminder needs to remain active until it sounds, especially if the computer or phone normally enters sleep mode during a quiet monitoring period. There will be no audible reminder for the engineering works timetable if the page has been closed or the phone or computer has gone to sleep. Keeping the screen awake and the browser running avoids discovering later that the scheduled check passed silently; volume should also be high enough to hear above office or depot noise.
An evening timetable check may fall just as a warm control room, home office or site cabin starts to feel stuffy. At 7:07 pm, steady air conditioning can make the wait more comfortable, but a cold draught beside the desk may become distracting. A moderate setting, closed windows and a seat away from the direct airflow provide a practical balance while service details are reviewed.
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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