Concrete sleepers, type F27. Investigations following the premature deterioration of a length at Tring (TM-CES-56)

A length of F27 Concrete Sleepers was laid in the up fast West Coast Main Line near Tring, between the 30 and 31 mileposts. After only 3 years, sleeper deterioration was sufficiently severe that relaying became necessary and the results of a visual examination of selected recovered sleepers was...