A method for assisting with the implantation, along a railway track (10, 12), of a plurality of access points of a radio-communications infrastructure, so that the infrastructure has an optimum coverage for a radio-communications device loaded on board a vehicle running on the track, characterised in that it first consists of providing: - first and second emitting wagons (1, 3), each emitting wagon being able to run along the track and including an emitting means (17, 37), similar to an emitting means which equips the access points to be implanted and controlled so as to emit respectively a first characteristic signal and a second characteristic signal; and, - a receiving wagon (2; 2'), able to run along the track and including at least one receiving means, said or each receiving means (27, 27') being similar to a receiving means which equips the device loaded on board a vehicle running on the track and being able to measure a first quantity relating to the first characteristic signal and a second quantity relating to the second characteristic signal, and then realising the steps consisting of: - a) placing the first emitting wagon in a point of the track corresponding to the implantation point of an access point determined in the preceding iteration; - b) while the emitting means of the first emitting wagon emits a first characteristic signal, moving the receiving wagon (2; 2') along the railway track in a first direction, away from the first emitting wagon; - c) as soon as said first quantity (P1, P11) relating to the first characteristic signal is less than a reference value, immobilizing the receiving wagon; - d) while the emitting means of the second emitting wagon emits a second characteristic signal, moving the second emitting wagon along the railway track in the first direction, away from the receiving wagon; - e) as soon as said second quantity (P3, P31) relating to the second characteristic signal is less than the reference value, immobilizing the second emitting wagon; and - f) storing in memory the current position (PK' i) of the second emitting wagon as an implantation point of an access point, steps a) to f) being iterated by moving, for a following iteration, le first emitting wagon along the railway track to the implantation point of an access point determined at a previous iteration, so as to gradually cover the railway track. - first and second emitting wagons (1, 3), each emitting wagon being able to run along the track and including an emitting means (17, 37), similar to an emitting means which equips the access points to be implanted and controlled so as to emit respectively a first characteristic signal and a second characteristic signal; and, - a receiving wagon (2; 2'), able to run along the track and including at least one receiving means, said or each receiving means (27, 27') being similar to a receiving means which equips the device loaded on board a vehicle running on the track and being able to measure a first quantity relating to the first characteristic signal and a second quantity relating to the second characteristic signal, - a) placing the first emitting wagon in a point of the track corresponding to the implantation point of an access point determined in the preceding iteration; - b) while the emitting means of the first emitting wagon emits a first characteristic signal, moving the receiving wagon (2; 2') along the railway track in a first direction, away from the first emitting wagon; - c) as soon as said first quantity (P1, P11) relating to the first characteristic signal is less than a reference value, immobilizing the receiving wagon; - d) while the emitting means of the second emitting wagon emits a second characteristic signal, moving the second emitting wagon along the railway track in the first direction, away from the receiving wagon; - e) as soon as said second quantity (P3, P31) relating to the second characteristic signal is less than the reference value, immobilizing the second emitting wagon; and - f) storing in memory the current position (PK' i) of the second emitting wagon as an implantation point of an access point,