Lateral Motion : Motion crosswise of the track experienced by all railcar parts except the wheels and axles that results from the flexibility that must be provided in the truck structure to permit its negotiation
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}