On this particular occasion the train crashed on the return journey and Bertrand was badly injured, suffering a crushed nose and facial scars which he retained throughout his life. Bertrand married Louis Celine Aclocque in 1844; their sons Marcel Alexandre (born 2 July 1847), Joseph Désiré (born 1853) and Léon Gratien (born 1858) all studied at the École Polytechnique, and Marcel went on to become a famous geologist.
Sa mga partikular na pagkakataon na ito ng tren crashed sa bumalik na paglalakbay at Bertrand ay malubha nasaktan, paghihirap ng isang durog ilong at mukha scars na kung saan siya ay mananatili sa kabuuan ng kanyang buhay. Bertrand kasal Louis Celine Aclocque sa 1844; kanilang mga anak Marcel Alexandre (ipinanganak 2 Hulyo 1847), Joseph pagnanais (ipinanganak 1853) at Leon Gratien (ipinanganak 1858) lahat ng mga aral sa École Polytechnique, at nagpunta sa Marcel na maging isang bantog heologo.