Manchester Oxford Road - historic equipment?

[RichardAsh1981]

I photographed this wooden door cupboard with ATE electric bells on top on platforms 2/3 (island) at Manchester Oxford Road. What is / was it for?

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Wooden cabinet on platform at Manchester Oxford Road.

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Electric bell manufactured by the Automatic Telephone and Electric Company (ATE), on top of wooden box on Manchester Oxford Road platform. The Automatic Telephone and Electric Company based at Strowger Works, Liverpool. www.gracesguide.co.uk/Automatic_Telephone_and_Electric_Co

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[Plethora]

Someone else will know the right answer, but my theory is those would go back to the days of barrow crossings and warn of an imminent train.