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Deptford Iron Company, also Deptford Ironworks
1841 Built a railway locomotive for the North Eastern Railway.  This locomotive was probably the one originally supplied to the Hartlepool Dock and Railway Co in July of 1841, and this 0-4-0 would become the York, Newcastle and Berwick Railway No.130 when that company took over the Hartlepool company and its number would remain No.130 when the North Eastern Railway was formed in 1853.
1843 'On Thursday, last week, one-half of the largest cast iron beam in the coal trade, for a pumping engine, 250 horse power, was cast at Deptford Iron Works. It weighed nearly twenty tons. The melting process was executed in two large cupolas, in about three hours, and at the time of tapping they contained from twenty-five to twenty-six tons.' 
1860 Advertisement: 'THE DEPTFORD IRONWORKS FOR SALE.
TO BE SOLD BY AUCTION, by Order of the Mortgagees, under an absolute Power of Sale, on Tuesday, 3rd July, 1860, at Mr. Bewick's, Crown and Sceptre Inn, High Street, Bishopwearmouth, Seven o'Clock in the Evening precisely, Mr. D. BROWELL, Auctioneer,
ALL that FREEHOLD FORGE, situate on the West Side of Wellington Lane, in the Parish of Bishopwearmouth, in the County of Durham, called the DEPTFORD IRONWORKS, As lately carried on Mr. John Wright, comprising Two powerful FORGE HAMMERS, and One Pair of IRON CLIPPING SHEARS, with all the necessary and improved Machinery and Gear, worked by HIGH-PRESSURE ENGINES of 40 and 25-Horse Power respectively; TWO FORGE FURNACES, CRANES, &c. There is also a powerful FAN BLAST, Two superior DRILLING MACHINES, large TURNING LATHE and GRINDSTONES, worked by a HIGH-PRESSURE ENGINE of 12-Horse Power; also, a large ANCHOR and KNEE SHOP, containing Eight Hearths, and requisite Cranes, Blocks, Stocks, and Clams ; also, a large CHAIN SHOP, containing Five Hearths, and Iron Cranes, &c. There is a PATENT HYDRAULIC CHAIN CABLE TESTING MACHINE, capable of a Pressure of 100 Tons ; also, large and convenient Iron Warehouses, Stores, Sheds, and a Three-Stalled Stable with Hay Loft above.
These Premises are replete with large Iron Water Tanks, Wells, and every other Requirement for carrying on a most extensive Business.
The Machinery has been working up to a recent Period, and the Testing Machine, Drilling Machines, Boilers, &c are nearly new, and altogether the Works have ever been considered the best on the River Wear, and present such an opening for a Man of Business as seldom occurs. For further Particulars, apply to Mr. THOMAS THOMPSON, Solicitor, 53, Villiers Street, Sunderland.'