baulk road
... that Isambard Kingdom Brunel used light rails and heavy timber baulks for the Great Western Railway's baulk road track because existing technology could not produce strong rails?
... that <a href="./Isambard_Kingdom_Brunel" id="mwAas" rel="mw:WikiLink" title="Isambard Kingdom Brunel">Isambard Kingdom Brunel</a> used light rails and heavy timber baulks for the <a href="./Great_Western_Railway" id="mwAaw" rel="mw:WikiLink" title="Great Western Railway">Great Western Railway</a>'s <b id="mwAa0"><a href="./Baulk_road" id="mwAa4" rel="mw:WikiLink" title="Baulk road">baulk road</a></b> <a class="mw-redirect" href="./Permanent_way" id="mwAa8" rel="mw:WikiLink" title="Permanent way">track</a> because existing technology could not produce strong rails?