After the absorption of the Chester and Holyhead Railway by the LNWR in 1859, more branches connecting the line were built:
Conway Valley In the mid-nineteenth-century,
Llanrwst was an important market town, and a branch to it from the main line had been contemplated for some time. The LNWR promoted the
Conway and Llanrwst Railway was authorised by the
Conway and Llanrwst Railway Act 1860 (
23 & 24 Vict. c. cxlix) on 23 July 1860, and opened to the public on 17 June 1863. In 1868, with the growth of tourism, the line was extended to Betws-y-Coed At this time, the slate industry was expanding massively above Betws-y-Coed, at
Blaenau Ffestiniog. Although other railway connections existed there, the LNWR decided to extend the branch to reach it. The result was the Bettws Extension Railway; this involved a long tunnel bored through hard rock at considerable expense, which opened in 1879.
Amlwch branch After some false starts, a branch railway into Anglesey was authorised: the Anglesey Central Railway was authorised by the
Anglesey Central Railway Act 1863 (
26 & 27 Vict. c. cxxviii) on 13 July 1863. They had approached the LNWR to work their line, but had been rebuffed. A passenger service started from
Gaerwen to
Llangefni on 12 March 1865, worked by the LNWR, who had relented. The line was extended to
Llannerch-y-medd on 1 February 1866, and throughout to
Amlwch on 3 June 1867. The final section may have been opened to goods traffic earlier, on 10 September 1866. The line was acquired by the LNWR in 1876.
Dyserth branch There were lead and iron ore deposits at
Dyserth, a few miles south of the C&HR main line. The LNWR obtained powers to build from
Prestatyn to Dyserth by the
London and North-western Railway (New Lines) Act 1866 (
29 & 30 Vict. c. clxviii) of 16 July 1866. The line was known as the Prestatyn and Cwm Line, and was opened for goods traffic on 1 September 1869.
Dyserth Castle and Cwm Waterfalls were considered to be tourist attractions, and a steam railmotor service operated passenger services from 28 August 1905.
Holywell branch A localised combination of high quality minerals near
Holywell had led to an intensive local industry, and on 29 July 1864 the Holywell Railway was authorised to make a short branch, upgrading an earlier Holywell Limestone Company tramway, which crossed the C&HR main line on the level. The new line would make a bridge crossing, and have gradients of 1 in 27. It opened for mineral traffic in June 1867, but became disused and derelict some time in the following decade. The LNWR purchased it in 1891, but for the time being did nothing with it. In an inversion of the motivation elsewhere, the growth of passenger omnibus traffic encouraged the LNWR to reopen the line to passenger traffic. The
London and North Western Railway Act 1906 (
6 Edw. 7. c. lxxiii) and the
London and North Western Railway Act 1907 (
7 Edw. 7. c. lxxxvii) authorised this, and on 1 July 1912, the resurgent line opened, with a new curve connecting to the main line. The short line was a considerable success, but after
World War II decline intervened and it closed on 6 September 1954, except for a stub to Crescent Siding textile mills, which finally closed on 11 August 1957.
Wrexham, Mold and Connah's Quay Railway The Buckley Railway – in fact a tramway – had conveyed mineral products to a wharf at Connah's quay on the River Dee, since 1862. It was superseded by the Wrexham, Mold and Connah's Quay Railway, which upgraded the line to a locomotive railway, opening in 1866. The WM&CQR ran to the Buckley Railway wharf at Connah's Quay, but also made a connection with the C&HR main line near there, and this proved more useful, for interchange traffic, than was expected. The WM&CQR never transferred into LNWR ownership; it suffered terribly from lack of money, and it was the
Great Central Railway that acquired it, rescuing it from bankruptcy. The acquisition took effect on 1 January 1905.
Bethesda branch There were important and extensive slate quarries in the Penrhyn Estate south of
Bethesda, near Bangor. In 1801, a
narrow gauge tramway was constructed to convey the mineral to
Port Penrhyn a mile east of Bangor. In 1879, the tramway was upgraded to allow steam locomotives to run on it, and was renamed the
Penrhyn Quarry Railway. The slate traffic increased, and the LNWR proposed a branch line to the quarry. The line opened on 1884 to passenger trains and 1885 to mineral trains, though it terminated at Bethesda, about a mile from the quarry. Gradients were steep, at 1 in 40. Road competition led to closure of the passenger service in 1951, and the mineral traffic ceased in 1963. ==Llandudno Junction alterations==