sentences:  The Vale of Neath Railway was amalgamated into the Great Western Railway on 1 February 1865, but the locomotives retained their old numbers.The only locomotives on the Vale of Neath Railway in 1851 were these six bogie tank locomotives.Built by Robert Stephenson and Company, they were smaller-wheeled versions of Daniel Gooch's South Devon Railway Comet class locomotives that were built at the same time by various companies.