Canadian National trains pass through the Morrissey Rock tunnel, New Brunswick

a steam-hauled 'Ocean Limited' in 1952

"the Morrissey Rock was carved out in 1874 to complete the Intercolonial Railway line from Halifax to Québec City. Without the tunnel in the Morrissey Rock it would not have been possible to fulfill the wish of the Québec City Conference of 1864 to build a railway link “ad mare usque ad mare”, from sea to sea, which eventually brought about the conditions for Confederation in 1867. At the time the tunnel was the only one of its kind in the Maritime Provinces. The first through passenger train service from Halifax to Québec City was on July 6, 1876."