The Centre Boundaries

From 1^st April 1975, The Yorkshire Centre Territory is described as that part of North Yorkshire situated West of the Railway Line from Yarm to Northallerton to the boundary of York (excluding York) and West of the main York – Barlby – Howden Road to the Humberside Boundary, that part of Teesdale District of Durham situated South of the River Tees. 
West Yorkshire and South Yorkshire.