 On 15 April 1882, Grosvenor resigned his command of the Dorsetshire Yeomanry Cavalry and was appointed honorary colonel of the regiment, a post he held until 1895.In 1891, he was appointed chairman of the London and North Western Railway, of which he had been a director since 1870 and had eagerly promoted.In 1867 he was prompted by Emperor Napoleon III to head an international committee to promote a populist view of a Channel Tunnel, which contemplated a submarine railway between England and France.