parliamentary calendar. Montparnasse – Bienvenüe station is named after its location and the "father" of the Metropolitan system in Paris, Fulgence Bienvenüe. Thus it was a natural choice for an exhibition on the technology and literature of the metro, in celebration of its centenary in 2000. Extracts from works about the Metro adorn the walls of its corridors. Pasteur station has an exhibition dedicated to medicine, installed during the centenary of the Metro and the renovation of the station on Line 6. The panels depict the evolution of biology and medicine since Louis Pasteur, in the context of the time, and with various anecdotes. Renamed stations The names of six stations have been changed since the line's opening: 1923: Sèvres – Croix Rouge renamed Sèvres – Babylone. 25 August 1931: Marcadet renamed Marcadet – Poissoniers. 6 October 1942: Montparnasse renamed Montparnasse – Bienvenüe. 15 October 1945: Petits Ménages renamed Corentin Celton in honour of a member of the French Resistance who was working at the Hospice of the Petits Ménages and who was killed by the Nazis during the occupation. 11 May 1946: Torcy renamed Marx-Dormoy. 1989: Chambre des Députés renamed Assemblée Nationale. Operation Service In 2011, the end to end journey time was 35 minutes southwards and 36 minutes northwards. As with all Metro lines, the first trains leave at 05:30, from both terminus as well as from Porte de Versailles station. On most days, the last northbound train leaves Mairie d’Issy station at 00:39. The last southbound trains leave Porte de la Chapelle station at 00:39 and 00:42, the second terminating at Porte de Versailles station. On Fridays and Saturdays, the final departures are at 01:39. The train frequency is every two to four minutes during the day, and five to seven minutes in the late evening. The frequency on Sundays is four to six minutes. After 00:30 on Friday and Saturday evenings and bank holidays, the interval between trains is 10 minutes. The RATP employs two categories of staff: ticketing agents and drivers. The former manage the stations, sell tickets and look after passengers. Drivers are responsible for the operation of the trains. Rolling stock At its inception Line 12 operated four-motor Sprague-Thomson trains, equipped with 600 volt pantographs and scrubbers, the overhead system which supplies the trains with electricity. After the integration of the line into the CMP network, the overhead lines and pantographs were removed.