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Blackett persevered with his experiments. He was zealously assisted by Jonathan Foster the engine-wright, and William Hedley, the viewer of the colliery, a highly ingenious person, who proved of great use in carrying out the experiments to a successful issue. One of the chief causes of failure being the rack-rail, the idea occurred to Mr.
This new locomotive had a single 8-inch cylinder, was provided with a fly-wheel like its predecessor, and the driving-wheel was cogged on one side to enable it to travel in the rack-rail laid along the road.
The new iron road proved so much smoother than the old wooden one, that a single horse, instead of drawing one, was now enabled to draw two, or even three, laden waggons. Encouraged by the success of Mr. Blenkinsop’s experiment at Leeds, Mr. Blackett determined to follow his example; and in 1812 he ordered a second engine, to work with a toothed driving-wheel upon a rack-rail.
Chapman’s had been removed from the Heaton tramway in 1812, and was regarded as a total failure. And the Blenkinsop engine at Coxlodge was found very unsteady and costly in its working; besides, it pulled the rails to pieces, the entire strain being upon the rack-rail on one side of the road.
The insurgents destroyed bridges and the rack-rail; the latter has not been replaced, and the four and ten per cent grades are now laboriously overcome by means of Shay geared engines. Surveys show that the troublesome grades can be avoided by the construction of curves which will increase the length of the road by not more than three or four miles.
The rack-rail feature being undesirable, plans were made for the construction of the road as an adhesion road. No further rack-rail was built and one of the portions constructed was converted, but two short stretches of rack-rail remained near Puerto Plata, one of one mile and another of three miles. The Central Dominican Railway Company was incorporated for the operation of the road.
From this time forward considerably less difficulty was experienced in working the coal trains upon the Wylam tramroad. At length the rack-rail was dispensed with.
It was also very apt to get off the rack-rail, and then it stood still. The driver was one day asked how he got on? “Get on?” said he, “we don’t get on; we only get off!” On such occasions, horses had to be sent to drag the waggons as before, and others to haul the engine back to the work-shops.
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