page_title: Paris Métro Line 10
section_title: Westward expansion
hierarchical_section_title: Paris Métro Line 10 / History / Westward expansion
caption_attribution_description: English: The Paris Metro station Boulogne Pont de Saint-Cloud, end of the Ligne 10. Français&#160;: La station du métro parisien Boulogne Pont de Saint-Cloud, terminus de la Ligne 10 Русский: Вид на зал станции Парижского метрополитена «Булонь — Пон-де-Сен-Клу»
context_page_description: Paris Métro Line 10 is one of 16 metro lines in Paris, France. The line links the Boulogne – Pont de Saint Cloud metro station in Boulogne in the west with the Gare d'Austerlitz, travelling under the neighborhoods situated on the Rive Gauche in the southern half of Paris and the commune of Boulogne-Billancourt. Its two termini are Gare d'Austerlitz and Boulogne – Pont de Saint-Cloud.
  The line is entirely underground and stretches 11.7 kilometres across 23 stations. It has the least traffic of any of the 14 main metro lines.
  Initially, the MA 51 model trains, which had previously been used on line 13 until it joined line 14, circulated the tracks of line 10. These trains were first constructed with three cars on four chassis per train, and two trains permanently connected to make six cars per train, having an equivalent capacity to five cars on the classic metro trains. Because of the ineffectiveness of the MA 51 model, it was eventually completely replaced by the MF 67 model.
  The line's history is closely tied to that of lines 7, 8, and 13.
context_section_description: There was a period of forty years between expansion projects.  Finally, in 1977 a new expansion project began with the objective of improving the service to the borough of Boulogne-Billancourt.  Although the borough was served in the south already by line 9, this expansion was justified as the suburban community was the most populated of the Île-de-France apart from Paris and the region is relatively important.
  The expansion work, with consisted of 2.3 kilometers of track and two new stations, began in February 1977 and took place mostly in open air.  The two stations contain central platforms due to the narrowness of the rail network, spanning only twelve meters.  This constraint required a specific type of construction so to assure the structural stability of the adjacent buildings with respect to the settling of the earth.  The stable layer of chalk under the ground allowed for vaulted support structures.  Excavation began with a concrete-filled trench, and the tunnel containing both rails was connected at the buckle of Auteuil by two tunnels each with their own track.  For the first time on the Parisian network, the terminus did not contain a post-arrival turnaround due to the lack of space, so the maneuver took place before the station.  The opening of this section, which is entirely underground, took place in two phases: the first expansion to Boulogne-Jean Jaurès was inaugurated on 3 October 1980, and the second section to Boulogne-Pont de Saint-Cloud was opened on 2 October 1981.  Boulougne at first was serviced by only every other train, with the second train returning eastward via the loop at Auteuil.  After 6:40 pm, all trains serviced the entire line.
  Following the opening of the train station Saint-Michel - Notre-Dame on line B of the RER in February 1988, the station Cluny-La Sorbonne, closed in 1939, was reopened after 50 years of being closed to assure a connection with lines B and C of the RER.
  The line was modernized in 1974 with the establishment of the PCC.  In 1975, the Sprague-Thomas train model was replaced by the MA 51 model already found on line 13, with those trains eventually being replaced by the MF 67 model on 15 June 1994.  Line 10 is the only line, with the exception of the short 3bis and 7bis lines, that is not equipped with auto-pilot as the trains circulating at that time were not compatible with the technology.  When the trains are eventually replaced with a compatible model, it is believed that the relatively low traffic of the line will not justify the investment in the installation of such a system.
caption: The platform of the station Boulogne-Pont de Saint-Cloud.
exif: {"Image ImageWidth": "2000", "Image ImageLength": "3008", "Image BitsPerSample": "[8, 8, 8]", "Image Compression": "LZW", "Image PhotometricInterpretation": "2", "Image Make": "NIKON CORPORATION", "Image Model": "NIKON D40", "Image Orientation": "Horizontal (normal)", "Image SamplesPerPixel": "3", "Image XResolution": "299999/1000", "Image YResolution": "299999/1000", "Image PlanarConfiguration": "1", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS2 Windows", "Image DateTime": "2008:07:08 12:57:26", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "316", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "922", "Thumbnail JPEGInterchangeFormatLength": "5677", "EXIF ExposureTime": "1/13", "EXIF FNumber": "21/5", "EXIF ExposureProgram": "Aperture Priority", "EXIF ISOSpeedRatings": "1600", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2008:06:27 17:47:56", "EXIF DateTimeDigitized": "2008:06:27 17:47:55", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "4", "EXIF ShutterSpeedValue": "92511/25000", "EXIF ApertureValue": "207039/50000", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "4", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire", "EXIF FocalLength": "26", "EXIF SubSecTime": "90", "EXIF SubSecTimeOriginal": "90", "EXIF SubSecTimeDigitized": "90", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "1825", "EXIF ExifImageLength": "2896", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CVAPattern": "[0, 2, 0, 2, 2, 1, 1, 0]"}