Operation Woodlark, also known as the Jørstadelva Bridge sabotage, was an operation carried out on 13 January 1945 by members of the Norwegian Independent Company 1 during the Second World War The aim was to blow up a railway bridge in order to disrupt the Nordland Line railway in Snåsa Municipality, Norway. Six hours after the bridge had been destroyed, a military troop train was derailed and crashed into the river below, killing 70–80 people and injuring some 100 more. It is the most deadly rail incident ever in Norway.