Sentence:  [...] and Temple station, which had to have a very modestly proportioned station building on the insistence of the Duke of Norfolk who owned the land on which it was built, and where the trains under the glass roof of the station were not allowed to blow their <WSD>whistles</WSD>, at the insistence of the barristers in the nearby Inns of Court. 
Meaning of the word marked with <WSD> tags:  (device) A device designed to be placed in the mouth and blown, or driven by steam or some other mechanism, to make a whistling sound.