It negotiated successfully with the Marquess of Ailesbury to run a new line from the M&SWJR station in Marlborough, through a 640-yard tunnel and across Savernake Forest.
On 18 March 1664, Robert Bruce, 2nd Earl of Elgin in the Peerage of Scotland was created Baron Bruce, of Skelton in the County of York, Viscount Bruce, of Ampthill in the County of Bedford, and Earl of Ailesbury, in the County of Buckingham, all in the Peerage of England.
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In 1868 the 2nd Marquess also inherited the Earldom of Cardigan from his kinsman the 7th Earl of Cardigan, and so the Marquesses of Ailesbury now also hold the titles Earl of Cardigan (1661) and Baron Brudenell, of Stonton in the County of Leicester (1628), in the Peerage of England, as well as being Baronets of England, styled "of Deene in the County of Northampton".
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His son, Charles Brudenell-Bruce, 2nd Earl of Ailesbury was created Viscount Savernake, of Savernake Forest in the County of Wilts, Earl Bruce, of Whorlton in the County of York, and Marquess of Ailesbury, in the County of Buckingham, on 17 July 1821, all in the Peerage of the United Kingdom.
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Ever since Thomas Bruce, 2nd Earl of Ailesbury succeeded his father in 1685, every Earl and Marquess of Ailesbury has also been a Hereditary Warden of Savernake Forest.
Charles Cornwallis, 1st Marquess Cornwallis | Robert Gascoyne-Cecil, 3rd Marquess of Salisbury | Marquess | Francis Rawdon-Hastings, 1st Marquess of Hastings | Richard Wellesley, 1st Marquess Wellesley | Marquess of Bute | Wills Hill, 1st Marquess of Downshire | James Broun-Ramsay, 1st Marquess of Dalhousie | David Cecil, 6th Marquess of Exeter | Robert Grosvenor, 1st Marquess of Westminster | Henry Paget, 1st Marquess of Anglesey | Frederick Hervey, 8th Marquess of Bristol | Frederick Hamilton-Temple-Blackwood, 1st Marquess of Dufferin and Ava | Victor Hervey, 6th Marquess of Bristol | Robert Wynn Carrington, 1st Marquess of Lincolnshire | Marquess of Rockingham | Marquess of Lansdowne | marquess | John Neville, 1st Marquess of Montagu | Freeman Freeman-Thomas, 1st Marquess of Willingdon | Paul Marquess | Marquess of Milford Haven | Marquess of Anglesey | Marquess of Ailsa | John Hamilton-Gordon, 1st Marquess of Aberdeen and Temair | William Parr, 1st Marquess of Northampton | Victor Hope, 2nd Marquess of Linlithgow | Marquess of Sligo | Marquess of Salisbury | Lawrence Dundas, 3rd Marquess of Zetland |