Compound Fissure : A progressive fracture originating in a horizontal split head which runs up or down in the head of the rail and continues to grow until it turns at a right angle to the rail length
Ilan Kelman (ed.), Vulnerability and Resilience Definitions and References, Version 2, 2007. http://www.islandvulnerability.org/docs/vulnres.pd f, (Vulnr and Resilience - Brit) {524}