Method for measuring the uplift of electrical contact lines on railway lines, wherein the measurement is performed by means of visual detection, wherein a precalibrated angle sensor is used, characterised in that - by using the angle sensor an uplift measuring device (H 1/2) is positioned between the contact wire and track plane (L 1/2), wherein the lateral movement of the contact wire x has been determined in advance for the whole measurement area as a function of the measured uplift (x = f(m)) and the uplift a is determined according to the relationship a = h + m 1 − x d − h wherein h = s sin(β) - vertical distance between focal point and contact wire in a position of rest m = d tan (α + β)- measured uplift x = f(m) - lateral offset of the contact wire during the uplift d = s sin(β) - horizontal distance between the focal point and contact wire in a position of rest s - distance between the focal point and contact wire in a position of rest α = ω 2 - ω 1 - deflection of the contact wire measured by the angle sensor in uplift position relative to the position of rest ω 1 - measured angular position in uplift position ω 2 - measured angular position in a position of rest β - angle between the track plane and contact wire in a position of rest and the trajectory is determined by lifting the contact wire with a rod and measuring the sensor signal (m) or from the support point geometry or by means of two cameras and recording a movement of the contact wire movement over the whole measurement area. - by using the angle sensor an uplift measuring device (H 1/2) is positioned between the contact wire and track plane (L 1/2), wherein the lateral movement of the contact wire x has been determined in advance for the whole measurement area as a function of the measured uplift (x = f(m)) and the uplift a is determined according to the relationship a = h + m 1 − x d − h wherein h = s sin(β) - vertical distance between focal point and contact wire in a position of rest m = d tan (α + β)- measured uplift x = f(m) - lateral offset of the contact wire during the uplift d = s sin(β) - horizontal distance between the focal point and contact wire in a position of rest s - distance between the focal point and contact wire in a position of rest α = ω 2 - ω 1 - deflection of the contact wire measured by the angle sensor in uplift position relative to the position of rest ω 1 - measured angular position in uplift position ω 2 - measured angular position in a position of rest β - angle between the track plane and contact wire in a position of rest and the trajectory is determined by lifting the contact wire with a rod and measuring the sensor signal (m) or from the support point geometry or by means of two cameras and recording a movement of the contact wire movement over the whole measurement area. h = s sin(β) - vertical distance between focal point and contact wire in a position of rest m = d tan (α + β)- measured uplift x = f(m) - lateral offset of the contact wire during the uplift d = s sin(β) - horizontal distance between the focal point and contact wire in a position of rest s - distance between the focal point and contact wire in a position of rest α = ω 2 - ω 1 - deflection of the contact wire measured by the angle sensor in uplift position relative to the position of rest ω 1 - measured angular position in uplift position ω 2 - measured angular position in a position of rest β - angle between the track plane and contact wire in a position of rest and the trajectory is determined by lifting the contact wire with a rod and measuring the sensor signal (m) or from the support point geometry or by means of two cameras and recording a movement of the contact wire movement over the whole measurement area.