Fort Heldsberg
... that the rail line at the Swiss Fort Heldsberg incorporated a turnout to derail enemy armored trains?
... that the rail line at the Swiss <b id="mwDh4"><a href="./Fort_Heldsberg" id="mwDh8" rel="mw:WikiLink" title="Fort Heldsberg">Fort Heldsberg</a></b> incorporated a <a href="./Railroad_switch" id="mwDiA" rel="mw:WikiLink" title="Railroad switch">turnout</a> to <a href="./Derail" id="mwDiE" rel="mw:WikiLink" title="Derail">derail</a> enemy <a href="./Armoured_train" id="mwDiI" rel="mw:WikiLink" title="Armoured train">armored trains</a>?