There is an Interesting article about the Cahir Viaduct (1955 & 2003) in The Bridges Of Dublin web site .http://www.bridgesofdublin.ie/bridge-building/disasters/cahir-viaduct-co-tipperary-ireland-1955-2003
It describes an incident December 21st 1955 when beet wagons and the loco when over that bridge as well as the above incident.