Translate the following English sentence to French:
"With regard to your question on the reopening of the railway line between Oloron and Canfranc, we must study the land-based and sea-based alternatives which may help to alleviate the situation of traffic congestion at the two eastern and western extremes of the Pyrenees."
En ce qui concerne votre question, concernant la réouverture de la ligne ferroviaire Oloron-Canfranc, il faut étudier des alternatives terrestres ou maritimes qui soulageraient la situation de congestion du trafic que connaissent les deux extrémités des Pyrénées, tant occidentale qu'orientale.