Some 93 metres long and at an elevation of 73 metres, the Port-Daniel–Gascons railway tunnel is the only one still operating in Québec. The tunnel was built from 1905 to 1907. Sadly, eight people died during its construction, when a dynamite charge exploded prematurely. The scenic lookouts at the summit offer breathtaking views of the sea and the village.

In 2015, the Ministry of Transport, Sustainable Mobility and Transportation Electrification acquired the entire Gaspésie Railway network, including the railway section crossing the territory of the Port-Daniel—Gascons municipality. He informs us that:
No one may travel on the railway track or inside the tunnel.
Anyone traveling on the railway and inside the tunnel is exposed to the risk of falling rocks and is likely to encounter track maintenance vehicles.
The municipality asks for the collaboration of the citizens in order to diffuse this information. Belvederes are always accessible to citizens and visitors for the beauty of the landscape and the physical activity that it provides. But walking on the railway and the internal visit of the tunnel are not allowed.