The Gotthard Base Tunnel, the main rail connection between Switzerland and Italy and a key goods transport route, will reopen on Monday more than a year after an accident forced its closure. The accident took place on 10 August last year when a Swiss Federal Railways (SBB) freight train derailed due to a broken wheel. The derailment caused the train to crash into the gate separating the western and eastern tunnels, causing severe damage. An investigation after the crash revealed that hairline fractures in a wagon wheel caused the accident when pieces came away, causing the carriage to jump the…