That part of the Railway described in and authorised by the enabling Acts which commences at reference point NS 98488122 lying generally to the north or northwest of Snab Lane, Kinneil, where Railway No. 1 adjoins the railway authorised to be constructed, made and maintained by the Bo'Ness and Kinneil Light Railway Order 198612, and terminates at reference point NS96277966 lying generally to the northwest of Birkhill, where Railway No. 1 adjoins Railway No. 3 all wholly within the Parish of Bo'ness and Carriden and County of West Lothian (District of Falkirk in the Central Region), being a distance of about two kilometres nine hundred metres.