In
1803 Richard Trevithick was employed
by Samuel Homfray, the owner of the Penydarren Ironworks in Merthyr
Tydfil. Trevithick was asked to produce a locomotive to be used to
transport iron from Penydarren to the nearest canal. By February 1804
the Penydarren locomotive was ready for its first trip. On the 21st
February it managed to haul ten tons of iron, seventy passengers and
five wagons from the ironworks at Penydarren to the Merthyr-Cardiff
Canal. During the nine mile journey the Penydarren locomotive
reached speeds of nearly five miles an hour.
The Penydarren locomotive, with its single vertical cylinder,
8 foot flywheel and long piston-rod, became the first steam engine
to run successfully on rails. Trevithick's locomotive employed the
very important principle of turning the exhaust steam up the chimney,
so producing a draft which drew the hot gases from the fire more powerfully
through the boiler.
Trevithick's Penydarren locomotive
only made three journeys. Each time the seven-ton steam engine broke
the cast iron rails. Samuel Homfray came to the conclusion that Trevithick's
invention was unlikely to reduce his transport costs and so he decided
to abandon the project.
A full-size reproduction of the Penydarren
(1)
Richard Trevithick, letter to Davies
Gilbert (22 February, 1804)
Yesterday
we proceeded on our journey with the engine. We performed the nine
miles in four hours and five minutes. We had to remove some large
rocks on the way. On our return home one of the small bolts that fastened
the axle to the boiler broke, and all the water ran out of the boiler.
(2)
Richard Trevithick, letter to Davies
Gilbert (2nd March, 1804)
We have tried the carriage with twenty-five tons of iron, and found
we were more than a match for that weight. The steam is delivered
into the chimney above the damper. It makes the draught much stronger
by going up the chimney.
(3)
In May 1854, Thomas Ellis, an engineer from Tredegar, wrote a letter
describing the first journey the Penydarren took in February,
1804.
My father was at Penydarren when the engine was made and tried. Samuel
Homfray, proprietor of the Penydarren Iron Works, Merthyr Tydfil,
made a bet of 1,000 guineas with Richard Crawshay, of the Cyfarthfa
Iron Works, that Trevithick's steam-engine could convey a load of
iron from his works to the Navigation House (nine miles distant).
(4)
In October 1858, Rees Jones was interviewed by the Mining Journal.
I assisted Mr. Trevithick in the making of his locomotive. She worked
very well; but frequently her weight broke the tram-plates. On the
third journey she broke a great many of the tram-plates. She was brought
back to Penydarren by horses. The engine was never used as a locomotive
after this.
Available from Amazon Books
(order below)
