A holiday bicycle ride brought me to Biganos, between Bordeaux and Arcachon. The rail line here is straight, for kilometers long. South of Biganos, on the section to Dax, the straight stretch is even more than 30 km long. Must be quite boring as a train driver, but the “Midi” catenary system makes it intersting for railfans. It are still the original constructions, although between Bordeaux and Dax the system has been modified to allow 160km/h operation.