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of 18 Moorgate Street, London
1839 The company was established by royal charter as a result of a campaign by James Macqueen to improve the service to the West Indies.
1840 Admiralty contract awarded to deliver mail to the Caribbean. Placed order with Caird and Co for 4 paddle steamers.
1842 First departure from Falmouth.
By 1850 was operating services to North and South America
1851 A supplementary charter was obtained.
1882 A supplementary charter was obtained.
1884 The peak its fortunes was reached.
1895 the company owned 27 seagoing ships
By 1899, over its life, the company had lost 21 ships, a dismal safety record.
1905 the Royal Mail Co's Caribbean contract was not renewed.
1901 Owen Cosby Philipps started to buy shares in the Royal Mail Steam Packet Co, which was in financial difficulties.
By 1903 Royal Mail was in a poor state, reflected in the company’s share price. Philipps and his financier brother John gained control. Philipps became chairman. The company became the basis of what was later known as the Kylsant Group. William J. Pirrie of Harland and Wolff offered to build modern tonnage for the company at cost-price, in return for receiving all repair work and subsequent contracts, beginning a 20 year relationship.
1904 A supplementary charter was obtained. This charter provided that no foreigner shall be qualified to hold office as a director or be employed as one of the principal officers of the company. 
1909 Acquired Elder Dempster and Co and restructured it. The company continued to trade under its own name.
1911 Royal Mail bought the Brocklebank share of the Shire company but the Brocklebank ships were quickly replaced, some with transfers from the Royal Mail SP Company.
1912 Acquired Union-Castle Mail Steamship Co.
1913 Philipps acquired the Nelson Line. The shipping lines retained their separate identities but Philipps and Pirrie began to treat all the associated companies as an integrated Royal Mail Group which was structured through a network of cross-shareholdings. Philipps controlled the empire through his ownership of management shares and his personal shareholdings in the relatively small management companies. Only Philipps understood the entire financial picture.
WWI much of the group's tonnage was requisitioned for service as troopships, hospital ships, colliers, and armed merchant cruisers; about 100 ships were lost.
Post War: Philipps and Pirie began to raise new capital, largely to pay for replacement liners.
1927 The Kylsant group became the largest shipping group in the world when it took over the White Star Line.
1930 The company ran into financial trouble, and the British government investigated its affairs.
1931 the Kylsant shipping group collapsed.
1931 The chairman, Owen Cosby Philipps, was imprisoned for misrepresenting the state of the company to shareholders. So much of Britain's shipping industry was involved that arrangements were made to guarantee the continuation of ship operations after it was liquidated.
1932 Royal Mail Lines Ltd was created to take over the ships of Royal Mail Steam Packet Co and other companies of the former group.