Conybeare returned to England, and was elected as a Member of the
Institution of Civil Engineers on 2 December 1856. He lived initially in
Kew Green and then
Chiswick, where his son,
Charles F. P. Conybeare, was born, before moving to Duke Street, Westminster (now John Adam Street), and then to Scarsdale Lodge in
Kensington. He set up a civil engineering practice, principally engaging in work for railway companies. On 31 July 1858, from his business address in Abingdon Street, Westminster, he was granted patents for "Improved apparatus and machinery for the laying of submarine telegraph cables" and "Improvements in apparatuses for generating and superheating steam and for producing the condensation of steam". Conybeare's work during this period included: • 1860: Work on the
Chard and
Taunton Railway scheme. Powers to build it were granted by an
act of parliament in 1861, but nothing was built until the
Bristol and Exeter Railway took over the powers and opened the line in September 1866. • 1860s: Engineer to the West Cork Railway and the Cork & Kinsale Railway during the 1860s. He also designed the railway hotel at
Kinsale, but it was never finished. • 1861: Work on the Brecon and Llandovery Railway • 1861-2: Work for the
Llanelli Railway & Dock Company • 1864: Deposited plans for a Southampton and Isle of Wight Railway, intended to pass near
Beaulieu Abbey to the
Solent. Nothing came of this. • 1864: With others, engaged by the
Sheffield authorities to investigate the
Great Sheffield Flood, caused by the breaching of the newly built
Dale Dike Reservoir. • 1866: With Alexander Sutherland, built the Cefn Coed Viaduct, a Grade II*
listed building and the third largest viaduct in Wales. It carried the
Brecon and Merthyr Railway (now part of the
Taff Trail), across the
River Taff at Pontycapel, near
Cefn-coed-y-cymmer. Sutherland was a friend of
Robert Thompson Crawshay of the nearby
Cyfarthfa Ironworks, and the viaduct was built on a curve to satisfy conditions laid down by the Crawshay Estate. ==Ecclesiastical work in Britain==