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R. B. Longridge and Co of Bedlington.
From about 1814, Bedlington was making parts for locomotives
About 1816 Michael Longridge was made a partner in the works
They were well known for the production of railway tyres in competition with Lowmoor Ironworks. Its proprietor was Michael Longridge, Senior who also managed Robert Stephenson's works during the latter's absence abroad. He was also proprietor of the Bedlington Ironworks which pioneered the rolling of long malleable iron rails.
c.1827 locomotive factory at Bedlington
1828 Michael Longridge, Senior wrote to Joseph Pease acknowledging receipt of cast iron part of the wheels for the locomotive engine "per Newcastle" (sic). Asked that Timothy Hackworth should be present to see that everything is done as he wishes and requests that he is given 3 days leave for the purpose
1829 Biddulph and Gordon, of Bedlington Ironworks, took a lease on land between the bridge and the Rose and Crown Inn, on the opposite side of the river from the works. Longridge seems to have been considering building a locomotive factory at Bedlington for some time.
c.1836 Michael Longridge, Senior announced plans to build an up-to-date locomotive factory on the Bebside site. The news caused consternation amongst the members of the Robert Stephenson Co in Newcastle, of which Michael Longridge was an original partner, as the new company would be a direct competitor to the Newcastle works.
1836 Robert Stephenson wrote to Joseph Pease about Longridge's plans and suggested considering offering the Forth Street works to the Bedlington Company.
1838 Michael Longridge, Senior built an up-to-date locomotive factory on the site. The engine builders styled themselves R. B. Longridge and Co., under the direction of Robert Bewick Longridge, Michael’s fourth son. Bedlington had built a few engines previous to this but now the company built them in large numbers
At their peak they employed 1,500 workers.
The first locomotive was an 0-6-0 called Michael Longridge for the Stanhope and Tyne Railway. This was followed by a number of 2-2-2 locomotives for several European railways.
An 0-4-2 locomotive Bedlington was built by Messrs Longridge and Co 
1838-39 At least twenty locomotives built
1846-7 Sixty locomotives built. Business increased in 1846 with about sixty engines for the London and Birmingham Railway, the Midland Railway and the London, Brighton and South Coast Railway. While the export trade experienced a lull, orders continued to be fulfilled for the home railways, including ten 4-2-0 Crampton locomotives for the Great Northern, which were later converted to 2-2-2 by Archibald Sturrock.
Strong competition developed in locomotive building; Bedlington was ill placed to compete. Its proximity to the coal mines and advantages in use of river-bourne freight became less significant considering the problems of dragging their locomotives up on to the high road and the advantages that other ironworks had in access to the main railways to achieve economies in transport
1852 The last locomotives were made.
By the time the locomotive works closed in 1853 it had produced some two hundred engines.
1914 Robert Bewick Longridge died at the age of 93.
From 'Short Histories of Famous Firms' by Ernest Leopold Ahrons The Engineer - 1921/01/21.
One of the best-known firms in the North of England during the first half of the nineteenth century was that established at Bedlington Ironworks on the River Blythe, about 13 miles north of Newcastle and 5 miles south east of Morpeth. The origin of Bedlington Ironworks goes back into the eighteenth century, for in 1785 the works were purchased by Mr Michael Longridge, grandfather of the well-known engineer who was President of the Institution of Mechanical Engineers in 1917-1919. The works at that time consisted of a forge, and the large forgings manufactured there were known throughout the North of England for their excellence. Forged anchors for ships formed one of the celebrated products of the firm. With the growth of the engineering trade in the early part of the nineteenth century, the firm established additional works in which engines and general machinery were manufactured. These works were afterwards under the management of Mr Robert Bewick Longridge, the son of Mr Michael Longridge, and amongst the activities of this branch of the firm, the manufacture of locomotives was begun at some period between 1834 and 1837.
1841 Jupiter, Saturn, Mars, Venus, Mercury, Lucifer