Set of 6 technical data sheets, published by the British Standards Institution in 1959 / 1960 providing information about the standards for various railway products in a summary sheet form. Each sheet has been folded into 8 with the title and other sheets on the outside when folded. .1 - Sheet 3A - Flat Bottom Railway Rails, fishplates and Steel sleepers - PD 3876 - August 1960. .2 - Sheet 3B - Axles, Tyres, Solid Rolled Steel Wheels and disc wheel centres - PD3277 - December 1959 .3 - Sheet 3C - Steel billets, blooms, bars and forgings for railway rolling stock - PD 3361 - April 1959 .4 - Sheet 3D - Steel slabs, plates, sections, bars and rivets for loco boilers, locomotives, carriages and wagons - PD 3387, May 1959. .5 - Sheet 3E - Laminated springs and spring steels - PD 3365 April 1959 .6 - Sheet 3F - Helical and Volute Springs and Spring Steelstrams, tramways, steel, wheels, springs, specification, materials