Translate the following English sentence to French:
"For this reason, any comparison must be made on the basis of the value of the consignments, and, if it is calculated this way, the share the railways have is just - surprise, surprise - 3%."
Pour cela, il faut faire la comparaison en se basant sur la valeur des transports et, calculée ainsi, la part du rail reste - ô surprise ! - à seulement trois pour cent.