The story
The company was founded by Charles Waring, William Waring and Henry Waring in 1841 in York as a civil engineering business.
By 1853 the company was working for the Central Peninsular Railway Company in Portugal.
It went on to complete numerous railway structures including three viaducts in Luxembourg (including the Passerelle) and the station (but not the roof, which was tendered separately) of St Pancras in London.
From Wikipedia’s article on Waring Brothers, shared under CC BY-SA 4.0.3