File:Tunnels ferro. asymétriques, Montrichard (41).jpg
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DescriptionTunnels ferro. asymétriques, Montrichard (41).jpg |
Français : Observez ce portail de tunnel, banal en apparence. N'y-a-il pas un élément sautant aux yeux ? La galerie droite est plus haute !
La relation Tours-Vierzon, barreau de 115 km mis en service vers 1870, est à l'origine à voie unique, comme de nombreuses dessertes secondaires. Début XXe la ligne est doublée, un nouveau tunnel est donc accolé au 1er. Seulement les normes techniques de l'époque évoluent plus vite que la vitesse des convois, de plus en plus volumineux ! D'où la différence de gabarit. La photo est prise ici vers l'ouest, direction Tours. Les 2 tubes, longs de 645 m, passent sous le collège J. du Bellay en décrivant une courbe, avant de déboucher sur la gare de la localité. Dans le sens opposé, on trouve un autre tronçon souterrain de près de 400 m. Segments séparés par un bref passage à l'air libre, sous la route Blois-Loches. L'axe est mis sous tension en 2008, au titre de modernisation de la transversale Lyon-Nantes (projet inachevé à ce jour, dans sa partie bourguignonne). Le choix se porte sur le 25 kV alternatif alors que les extrémités sont alimentées en 1 500 volts continus, trahissant l'équipement plus ancien du réseau sud. Les ingénieurs y sont parvenus, petit exploit, sans modifier le radier, c'est-à-dire les fondations de l'ouvrage. En d'autres termes, la plateforme des voies ne fût pas abaissée. A contrario le tirant d'air disponible dans la galerie d'origine, insuffisant, nécessita le creusement de niches à même la voûte, afin d'y loger les supports des équipements électriques. |
Date | |
Source | Own work |
Author | Dacia 1410 Sport |
Camera location | 47° 20′ 44.16″ N, 1° 11′ 07.33″ E | View this and other nearby images on: OpenStreetMap | 47.345600; 1.185370 |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:15, 9 March 2024 | 1,048 × 700 (488 KB) | Dacia 1410 Sport (talk | contribs) | Uploaded own work with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D3400 |
Author | |
Copyright holder | |
Exposure time | 1/125 sec (0.008) |
F-number | f/11 |
ISO speed rating | 100 |
Date and time of data generation | 11:00, 6 March 2024 |
Lens focal length | 45 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Ver.1.11 |
File change date and time | 11:00, 6 March 2024 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.3 |
Date and time of digitizing | 11:00, 6 March 2024 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 4.5 APEX (f/4.76) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 37 |
DateTimeOriginal subseconds | 37 |
DateTimeDigitized subseconds | 37 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 67 mm |
Scene capture type | Landscape |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
GPS tag version | 2.3.0.0 |
Rating (out of 5) | 0 |