single line. The extension to Carnarvon was undertaken immediately, and the line was opened throughout to Carnarvon on 1 July 1852; goods and mineral traffic started on 10 July 1852. The extension diverged from the Port Dinorwic line about a mile east of that place, necessitated by the ground levels: the continuation had to be above the level of the Port. The stub to the port became known as the Port Siding. The Bangor and Carnarvon Railway was leased to the Chester and Holyhead Railway in 1854, and absorbed by the London and North Western Railway (which had itself absorbed the C&HR) in 1867. The passenger train service was good, six trains running each way daily, with three on Sundays; population growth in the district was vigorous. On 9 May 1865 there was an accident at the Menai Bridge Junction station; a train from Carnarvon was standing in the branch loop platform at a signal at danger. The exit from the platform was in the up direction; it would cross the down main C&HR line, and a down train was approaching on that line. The driver of the Carnarvon train was given the right-away by his guard, and he started away without checking the starting signal, which was still at danger. 25 persons were injured in the resulting collision. In 1871 powers were obtained to double the line, and the Menai Bridge to Treborth section and the Port Dinorwic to Caernarfon sections were doubled in 1872; the central section was finished in 1874, including a duplicate bore for Vaynol Tunnel. Carnarvonshire Railway In 1867 the Carnarvonshire Railway was opened from Pant southward to Afon Wen: Pant was south of the Seiont River. Carnarvon and Llanberis Railway In 1864 the Carnarvon and Llanberis Railway was authorised. It was to run from the Carnarvonshire Railway near its Carnarvon terminus, to Llanberis. Slate was to be the primary traffic. In 1865 a connecting line was authorised, northwards from the Carnarvonshire Railway to join the Bangor and Carnarvon Railway on the north side of the town: it became known as the Carnarvon Town Line. The C&LR was short of cash to build the Town Line: the LNWR seized the opportunity, and acquired joint ownership of the Llanberis end of the (unbuilt) line and running powers over the rest of the line, in exchange for permission to use the B&CR station at Carnarvon. Relations between