Service trials of concrete sleeper assemblies: The so called 'Economical' design (TM-TS-50)

In past years, the Research Dept. kept observations on service trials of many early and prototype concrete sleeper assemblies. The last comprehensive report issued was number E560, dated September 1965, and in the immediate subsequent years the class F23 sleeper with cast-in Pandrol shoulders became the generally accepted standard sleeper...