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Abstract

In order to position a set of one or more tools supported by a railway intervention vehicle progressing on a railway track (22), data is received characterising a curvilinear abscissa of a spatial indexation marker (56) of known signature, and a positioning of the spatial indexation marker (56) with respect to a reference line (122A, 122B, 222) of the railway track (22), and coordinates of points or lines of interest (A, B, C, D, A′, B′, C′, D′, 162, 163, 164) in a two-dimensional locating reference system linked to the spatial indexation marker (56) and to the reference line (122A, 122B, 222), one or more transposition matrix cameras (44) acquire a set of one or more transposition bitmap images in a spatial reference system of the transposition system (16), fixed with respect to the transposition chassis (45), and an odometer (28) acquires progression data of the transposition system with respect to the railway track (22). Then the spatial indexation marker (56) in the set of one or more transposition bitmap images is identified as a function of the progression data and curvilinear abscissa data, which makes it possible to determine data characteristic of the spatial indexation marker (56) and the reference line (122A, 122B, 222) in the spatial reference system of the transposition chassis, and to calculate transposed coordinates of the points or lines of interest (A, B, C, D, A′, B′, C′, D′, 162, 163, 164) in the spatial reference system of the transposition system (16), as a function of data characteristic of the spatial indexation marker (56) and the reference line (22A) in the spatial reference system of the transposition system, and coordinates of the points or lines of interest (A, B, C, D, A′, B′, C′, D′, 162, 163, 164) in the locating reference system.

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