by Gwilym and John Griffiths
In October 1858, Rees Jones was interviewed by the Mining Journal. He assisted Richard Trevithick in the making of his locomotive. It worked very well but frequently its weight broke the tram-plates. On the third (see below) journey it broke a great many of the tram-plates. It was brought back to Pen y Darren by horses. The steam-engine was never used as a locomotive after this.
‘The Pen y Darren Locomotive’ added, without stating the source, that: Over the next few weeks the locomotive made numerous journeys over the tramroad and was later used as a stationary engine for pumping water, winding coal and driving a forging hammer.
The newspaper, Cambrian, reported the trial briefly: ‘Yesterday’, the long-awaited trial of Mr Trevithick’s newly-invented steam engine, for which he obtained His Majesty’s letters patent, to draw and work carriages of all descriptions on various kinds of roads, as well as for a number of other purposes to which its power may be usefully employed, took place near this town, and was found to perform to admiration all that was expected from its warmest advocates.
In the present instance, the novel application of steam by means of this truly valuable machine was made use of to convey along the tramroad ten tons, long weight, of bar iron from Pen y Darren Works to the place where it joins the Glamorgan Canal, upwards of nine miles distant; and it is necessary to observe that the weight of the load was soon increased from ten to fifteen tons by about seventy persons riding on the trams, who, drawn thither, as well as many others, by invincible curiosity, were eager to ride at the expense of the first display of the patentee’s abilities in this country.
To those who are not acquainted with the exact principle of this new engine, it may not be improper to observe that it differs from all others yet brought before the public, by disclaiming the use of condensed water, and discharges it into the open air, or applies it to the heating of fluids, as convenience may require. The expense of making engines on this principle does not exceed one half of many on the most approved plan made use of before this appeared. It takes much less coal to work it, and it is only necessary to supply a small quantity of water for the purpose of creating steam, which is the most essential matter. It performed the journey without feeding or using any water, and will travel with ease at the rate of five miles an hour. It is not doubted but that the number of horses in the kingdom will be very considerably reduced, and the machine, in the hands of the present proprietors, will be made use of in a hundred instances never yet though of for an instant’.
The Parliamentary Gazetteer of England and Wales, circa 1840, added extra bits of information: The first locomotive, though with toothed wheels, is said to have been started on the old Merthyr-Tydvil railroad in 1804, having been patented by Messrs Vivian and Co, in 1802; it was then stated to have drawn ten tons of bar iron at the rate of five miles an hour; but it did not come into anything like general use for the carriage of goods till ten years afterwards. The present (1840) noble species of locomotives, however, and railways, are of still more recent origin. There was clearly some conflict over the patent?
It seems likely that the authors must have made a mistake over ‘toothed wheels’: perhaps they were thinking of the cog-wheels on the engine itself?
We find it hard to believe that there was any need or purpose to construct the smaller tunnel near Plymouth Works in 1802, though this is the date so stated by Leo Davies in ‘Bridges of Merthyr Tydfil’, page 155, and the tunnel certainly existed by the time of John Woods’ 1836 Street Map of Merthyr Tudful. Richard Trevithick did not mention it in his letter describing the journey (but see below) yet, at only 8ft 4in high, it must have proved a problem for his steam locomotive with a stack of almost similar height? The second tunnel was apparently built around 1860 or 1862, per Leo Davies. Why was it needed? Why was it so much higher at 13ft 0in? The lower tunnel would have limited the height of any transport through it, a quarter of a century after the arrival of the Taff Vale Railway.
A Trystan Edwards, in ‘Merthyr, Rhondda and The Valleys’, page 163, apparently knew (from frustratingly unnamed sources but see above quote) that Richard Trevithick was assisted in the construction of the engine by Rees Jones of Dowlais and that the engine-driver’s name was Watkin Richards. He wrote that a collision with a bridge brought down both bridge and stack (though Trevithick himself made no reference to this accident in his account). Trystan Edwards recorded that the engine failed to return, a fact totally incorrect according to Trevithick’s own account written at the time.
According to Joseph Gross, ‘The Merthyr Tramroad’, in Merthyr Historian, volume 1, Anthony Bacon refused to make the award of the bet because Richard Trevithick had moved some sleepers in the tunnel near Plymouth Works to the middle to allow the funnel to pass. This was supposed to have changed the existing track, violating one of the conditions of the wager. The return journey of the locomotive was not completed because it was said the gradient was too steep. This, too, contradicts other sources.