Many and difficult as were the engineering problems involved in the construction of the coast line none aroused greater interest or put scientific skill and courage to a severer test than that, to which we have already briefly alluded, of carrying the railway over the sand and river current into Barmouth. To the lay mind it appeared an almost insuperable task, and there were those who did not hesitate to whisper their doubts as to its practicability, one well-known local gentleman being reported to have gone as far as publicly to undertake to eat the first engine which ever crossed that formidable gulf. But engineers and craftsmen set to work with a will, and before long what had appeared an impossibility was rapidly taking shape as an actuality. Eight hundred yards in length, the greater portion was constructed on timber piles, over 500 in number, in 113 spans, driven into the sand. The navigable channel, at the Barmouth end, was crossed by an iron-work construction, of seven fixed and one opening span. The latter was of the drawbridge type, and when lifted at one end by means of large screws was carried on wheels and could be drawn back over the adjoining span. It was a lengthy as well as a cumbersome operation, and when, in 1899, the ironwork portion of the viaduct had become too weak for the constantly increasing loads of developing traffic, it was completely renewed with a modern steel structure of four spans, one of which was a spring span, revolving on the centre pier and giving two clear openings. The piers carrying the girders are formed of columns 8ft. in diameter sunk through the sand down to solid rock, which was reached at a depth of about 90 feet below high water mark. The columns are steel cylinders filled with concrete, and were sunk into position by means of compressed air on the diving bell principle, and owing to the depth below water at high tide, the men excavating inside were finally working under a pressure of three atmospheres, or 45 lbs. to the square inch. The contractors were the Cleveland Bridge and Engineering Co. Ltd., of Darlington. In 1906, and the following two or three years, the timber portion of the viaduct was also completely renewed in the same material, the contractor in this case being Mr. Abraham Williams of Aberdovey, who had built, or helped to build, many of the old wooden bridges on the coast line. The total cost of the renewals was approximately 60,000 pounds, and it is no small achievement that they were carried out without a moment's stoppage in the traffic. [Picture: Barmouth Bridge. Reproduced from the "Great Western Magazine."]