A computer-implemented method for diagnosing a railroad switch (SW) with a point machine (PM), comprising a)receiving a first and a second time series (TS1, TS2) of a sensor signal (SS) of the point machine (PM), the sensor signal (SS) being sensitive to an operation of the point machine (PM), wherein the second time series (TS2) is regularly taken from a current operation of the point machine (PM), and the first time series (TS1) is taken from a fault-free and/or historic operation period of the point machine (PM), from an operation immediately preceding the current operation, and/or from a data base with time series of reference operations, b)detecting changes (CH) in the first and the second time series (TS1, TS2) indicating changes of operational conditions of the point machine (PM), c) allocating an event point (E1-E4) of a respective change (CH) in the first and in the second time series (TS1, TS2) to a respective component (C1) of the railroad switch (SW) or of the point machine (PM) based on a simulation (SIM) modelling the respective component (C1), and d) for a respective component (C1): - identifying event points (E1-E4) allocated to that respective component (C1), - comparing the sensor signal (SS) at a first identified event point (E1-E4) in the first time series (TS1) with the sensor signal (SS) at a corresponding second identified event point (E1-E4) in the second time series (TS2), and - depending on the comparison, outputting a component-specific fault information (FI) and an identification (IDC) of the respective component (C1). a)receiving a first and a second time series (TS1, TS2) of a sensor signal (SS) of the point machine (PM), the sensor signal (SS) being sensitive to an operation of the point machine (PM), wherein the second time series (TS2) is regularly taken from a current operation of the point machine (PM), and the first time series (TS1) is taken from a fault-free and/or historic operation period of the point machine (PM), from an operation immediately preceding the current operation, and/or from a data base with time series of reference operations, the second time series (TS2) is regularly taken from a current operation of the point machine (PM), and the first time series (TS1) is taken from a fault-free and/or historic operation period of the point machine (PM), from an operation immediately preceding the current operation, and/or from a data base with time series of reference operations, b)detecting changes (CH) in the first and the second time series (TS1, TS2) indicating changes of operational conditions of the point machine (PM), c) allocating an event point (E1-E4) of a respective change (CH) in the first and in the second time series (TS1, TS2) to a respective component (C1) of the railroad switch (SW) or of the point machine (PM) based on a simulation (SIM) modelling the respective component (C1), and d) for a respective component (C1): - identifying event points (E1-E4) allocated to that respective component (C1), - comparing the sensor signal (SS) at a first identified event point (E1-E4) in the first time series (TS1) with the sensor signal (SS) at a corresponding second identified event point (E1-E4) in the second time series (TS2), and - depending on the comparison, outputting a component-specific fault information (FI) and an identification (IDC) of the respective component (C1). - identifying event points (E1-E4) allocated to that respective component (C1), - comparing the sensor signal (SS) at a first identified event point (E1-E4) in the first time series (TS1) with the sensor signal (SS) at a corresponding second identified event point (E1-E4) in the second time series (TS2), and - depending on the comparison, outputting a component-specific fault information (FI) and an identification (IDC) of the respective component (C1). <EOS>