A control system for monitoring a contact wire of an overhead power supplying line installed along an associated railway line , comprising at least: - a control and processing unit ; - one or more sensors which are suitable to be mounted on board of a railway vehicle and are adapted to provide to the control and processing unit first signals (S det ) indicative of one or more corresponding parameters (H, D, S) of said contact wire while the railway vehicle is travelling along the railway line ; - one or more devices which are arranged to provide to the control and processing unit second signals (S P ) suitable for calculating a position (P) of the railway vehicle along the railway line ; wherein said control and processing unit is configured for calculating: - based on at least the first signals (S det ) provided via said one or more sensors , one or more actual values for said one or more parameters (H, D, S) of the contact wire ; and - based on said second signals (S P ) received from said one or more devices , the actual position (P a ) of the railway vehicle along the railway line at which said actual values for said one or more parameters (H, D, S) of the contact wire have been calculated; wherein said one or more sensors comprise at least: - an optical transmitter and an associated optical receiver mutually arranged to provide signals (S det ) indicative of an actual dimensional parameter (D a ) of the contact wire , said optical transmitter and associated optical receiver comprising a pair of laser-based transmitter and associated receiver; and - a first optical sensor and a second optical sensor mutually arranged to provide signals (S det ) indicative of an actual stagger (S a ) of the contact wire with respect to a reference position, characterised in that said first optical sensor and second optical sensor comprising a first array of laser sensors and a corresponding second array of laser sensors spaced apart from the first array of laser sensors , and in that the control system further comprises a first software module configured to carry out a validation check for confirming the correctness of an identified portion of a contact wire , wherein said validation check is based on a correlation between the actual stagger value (S a ) calculated by the control and processing unit for the identified portion and a predicted stagger value (S P ) pre-calculated by the first software module for said identified portion. - a control and processing unit ; - one or more sensors which are suitable to be mounted on board of a railway vehicle and are adapted to provide to the control and processing unit first signals (S det ) indicative of one or more corresponding parameters (H, D, S) of said contact wire while the railway vehicle is travelling along the railway line ; - one or more devices which are arranged to provide to the control and processing unit second signals (S P ) suitable for calculating a position (P) of the railway vehicle along the railway line ; - based on at least the first signals (S det ) provided via said one or more sensors , one or more actual values for said one or more parameters (H, D, S) of the contact wire ; and - based on said second signals (S P ) received from said one or more devices , the actual position (P a ) of the railway vehicle along the railway line at which said actual values for said one or more parameters (H, D, S) of the contact wire have been calculated; - an optical transmitter and an associated optical receiver mutually arranged to provide signals (S det ) indicative of an actual dimensional parameter (D a ) of the contact wire , said optical transmitter and associated optical receiver comprising a pair of laser-based transmitter and associated receiver; and - a first optical sensor and a second optical sensor mutually arranged to provide signals (S det ) indicative of an actual stagger (S a ) of the contact wire with respect to a reference position, <EOS>