The article transcribed below appeared in the Western Mail 150 years ago today (28 October 1870).
THE EXPLOSION OF THE “KINGFISHER” LOCOMOTIVE AT DOWLAIS
INQUEST ON THE BODY OF JOAN THOMAS
The adjourned inquest on the body of Joan Thomas, aged 18, the woman who was scalded to death by the explosion of the locomotive known as the “Kingfisher” the property of the Dowlais Company, on the 1st instant, was resumed on Thursday by Mr. Overton, the coroner.
The nature of the accident may be best gathered from the evidence of David Price, the driver of the engine. He said: About half past eight on the morning in question, my engine was standing on a siding by the Bargoed pit, waiting for another engine to shunt trucks. I went to talk with the driver of another engine within twenty yards; and, within a few minutes of my leaving my engine, I saw the steam issuing from the fire-box. As I was passing from one engine to another, I met the deceased going towards my engine. She was employed by her uncle, who was the contractor for oiling the trams, and fetching nails and other things from Dowlais to the collieries, and was in the habit of travelling every day from Cae Harris Dowlais, where she resided, to the collieries, a distance of six miles, and returning in the evening. She was constantly in the habit of going backwards and forwards from the collieries to Dowlais for different things required at the works. I do not allow any persons to ride on the engine, unless they are engaged on the business of the company.
When I got back to my own engine, I found the deceased lying on the rails behind the engine. Mr. Matthew Truran came up at the time, and ordered the driver of the other engine to take her to Dowlais. She was scalded all over, and very bad. My two firemen were also scalded, but not severely. I then examined what was the cause of the accident, and found that one of the plates of the fire-box had burst, and caused the steam and water to escape. The locomotive was the Kingfisher, a tank engine, built by Sharpe and Co., of the Atlas Works, Manchester, and it had been at work four years and a half. We had taken in a supply of water half an hour before. It had been leaking a little below the part that burst, and we intended sending it to be repaired that night. There is no regular inspection of the engines unless we suspect there is something amiss, when they are sent in and examined by the fitters. My engine was examined by David Edwards, the fitter, a fortnight before, and he never complained. The young woman died that night.
David Edwards, fitter, said: I examined the engine after the explosion, and found that there was a hole of about six by four inches on the left side of the fire-box, two of the stay heads broken off, and the smoke end of the boiler blown open. I believe the explosion occurred from the weakness of the copper fire-box, which was so thin as to be unequal to bear the pressure. The fire-box has not been renewed since the engine came, four and a half years ago. I cannot undertake to say whether the plate was weakened by some cause or was originally too slight. I think the fire-boxes ought to last nine years.
Mr, Samuel Truran, the mechanical engineer of the company, confirmed the evidence of Edwards.
Mr. Wales, the Government inspector, gave the following evidence:- I have made an examination of the locomotive in question. I found that the copper of which the fire-box was made was originally 7-16ths of an inch thick, but from some cause that thickness was, at the time of the explosion, reduced to the thickness of a sixpenny piece. This rendered the copper at that point unable to longer resist the pressure of steam, which was 1201bs. per square inch, and hence the explosion. It is difficult to arrive at an average length of time copper fire-boxes last, so much depends upon the quantity of coal or coke consumed, and the work done by the locomotive; but I fancy from twelve to fourteen years might be taken as a fair average in this I case. Of course repairs are required during that time. It appears that the fire-box in question had only been used between four and five years. The pressure of steam at which locomotives are worked varies from 90lbs. up to 150lbs. per square inch, and it appears that the pressure in this case was 105lbs. per square inch. I am therefore of opinion that the copper was not reduced in thickness by the pressure of steam, but by the action of the fire, which would be greatly increased if the coal used contained much sulphur. The only safeguard against such danger which suggests itself to my mind is, that the copper fire-boxes should be regularly and frequently examined by an experienced boiler-maker, and when any doubt exists after the usual tests, then holes should be bored to ascertain the thickness of the copper, and if it is found that the thickness has been slightly reduced, the pressure of steam should also be reduced; but if found reduced to any considerable extent the fire-box should be removed altogether.
Mr. Samuel Davis, of the Atlas Works, Manchester, said: I have attended this inquiry by the direction or Messrs. Sharpe and Co. They were the manufacturers of the Kingfisher locomotive. There were two pieces of copper sent to us by the Dowlais Company. They were described as part of the copper box of this engine. They are reduced to a very thin state – to about 1-30th of an inch. The thickness originally was 7-16th. We do not use any test to each plate separately, but our men would easily discover if there was any deficiency in the thickness. I feel satisfied that the plates of this box were originally 7-16th thick. From the appearance of the plates, I should say the fire was the cause of the reduction in thickness. There was no incrustation arising from the water, I cannot perceive any indication of any operating causes to explain the explosion beyond the wear and tear by use. It is usual on all railways to have the boilers periodically tested with water pressure, but I do not know what is done in iron works and collieries and I consider that it should be made imperative. I quite concur in the major part of Mr. Wales’s evidence.
The Coroner having summed up, the Jury returned the following verdict:- “Accidental death from an explosion of a locomotive engine; and we recommend that in future a competent boiler maker be employed to make a regular inspection of the engines and boilers.”