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1872 William McDougall Courtney became a partner. Mr. Bailey served as chief engineering partner. The firm carried out many important railway works, such as the construction of bridges, girders, cylinder-foundations, and signals, including Bailey’s locking apparatus. In addition it manufactured land and marine engines, boilers, hydraulic machinery, and distilling-, brewing-, and milling-plant.
1873 Newspaper article: 'MONSTER IRON MASTING SHEERS. - We had an opportunity yesterday of inspecting, at the factory of Messrs. Courtney, Stephens and Bailey, a magnificent specimen of iron work on a large scale, and skill-in mechanical engineering, in a huge masting sheers or crane, constructed for "The Earl's Ship Building and Engineering Company" Hull. The ponderous proportions of the several parts of this great engine now lying in the factory where they were constructed, are well calculated to excite surprise, in the observer, and that surprise is increased when he examined the massive strength of every part, all made to combine to produce a lifting power equal to above fifty tons. Every part of it finished with the greatest care and precision and the entire machine must be classed as a splendid illustration of manufacturing capacity and scientific skill. The three monster legs of the sheers are composed of wrought iron tubular plates, riveted together. The outer legs are jointed in a cast-iron socket to be built into the solid masonry, on the quay, where it will be presently erected. .The back leg, by which the required altitude or angle is obtained is regulated by a long, continuous screw, which is fixed in a huge cast-iron tough, and is worked on a brass nut. The lifting chain revolves on a large cast-iron drum, supported on strong cast iron brackets. The mighty blocks through which this chain will work are alone most worthy of inspection, as are also the numerous details of the great iron structure which we have now great pleasure in bringing under public notice. It is now nearly ready to be shipped for its destination, and should be seen by all who are desirous for the promotion of the manufacturing interests and general material prosperity of Ireland, While it does, the eminent firm in whose establishment it was constructed the highest credit for public spirit, enterprise, end engineering capacity, it also shows what the skilled artizans residing amongst us can accomplish, even in competition, even with their more favoured brethren at the other side of the Channel. The monster sheers, when erected at Hull and in full work, will be an eloquent means of telling our English friends how much in the higher walks of labour can be achieved in Ireland in an open field of competition and fair play. We strongly recommend those interested in engineering works not to allow the monster sheers to be removed without carefully inspecting it.' 
1884 'FIRES IN DUBLIN. On Thursday morning a fire broke out at the iron foundry of Messrs. Courtney, Stephens, and Bailey, at Blackhall-place, Dublin, and did considerable damage to the foundry, forge, and pattern department. The damage is covered by insurance.'
1884 Mr Bailey retired.