Method for reliably determining current output information (I out (T N+M)) in the field of railway technology after failure of a client device which is connected to at least one sensor device via a network and has an evaluation unit, the method comprising the following method steps: a) determining input information (I in) at a reference time (T 1...T N) by means of the sensor device, wherein recovery information (I hol) is stored in the sensor device, which information comprises all or a selection of the input information (I in); b) transmitting the determined input information (I in) from the sensor device to the evaluation unit of the client device; c) determining output information (I aus), or state information that is necessary for deriving the output information (I aus), by processing the transmitted input information (I in) by means of the evaluation unit of the client device; d) storing, in a memory device outside of the sensor device, a data set (DS(T 1)...DS(T N)) comprising the transmitted input information (I in) and the output information (I aus) or state information determined therefrom; wherein the method steps a) to d) are repeated for different reference times T 1... T N, and wherein a continuity test is carried out with respect to continuous operation of the sensor device, wherein, after failure of the client device at a failure time (T failure). and reactivation of the client device at a reactivation time (T reactivation), the following method steps are carried out: e) transmitting the most recently stored data set (DS(T N)) from the memory device to the evaluation unit of the client device and f) transmitting, to the evaluation unit of the client device, the recovery information (I hol) which was stored in the time period between the reference time (T 1...T N) of the data set (DS(T N) stored most recently in the memory device and the reactivation time (T reactivation) of the sensor device; and g) determining, by means of the evaluation unit of the client device, the current output information (I aus (N+M)) based on the most recently stored data set (DS(T N)) and the transmitted recovery information (I hol), wherein step f) and therefore step g) are only carried out if the continuity check reveals that the sensor device was available between the reference time (T 1...T N) of the data set (DS (T N) stored most recently in the memory device and the reactivation time (T reactivation). a) determining input information (I in) at a reference time (T 1...T N) by means of the sensor device, wherein recovery information (I hol) is stored in the sensor device, which information comprises all or a selection of the input information (I in); b) transmitting the determined input information (I in) from the sensor device to the evaluation unit of the client device; c) determining output information (I aus), or state information that is necessary for deriving the output information (I aus), by processing the transmitted input information (I in) by means of the evaluation unit of the client device; d) storing, in a memory device outside of the sensor device, a data set (DS(T 1)...DS(T N)) comprising the transmitted input information (I in) and the output information (I aus) or state information determined therefrom; e) transmitting the most recently stored data set (DS(T N)) from the memory device to the evaluation unit of the client device and f) transmitting, to the evaluation unit of the client device, the recovery information (I hol) which was stored in the time period between the reference time (T 1...T N) of the data set (DS(T N) stored most recently in the memory device and the reactivation time (T reactivation) of the sensor device; and g) determining, by means of the evaluation unit of the client device, the current output information (I aus (N+M)) based on the most recently stored data set (DS(T N)) and the transmitted recovery information (I hol), wherein step f) and therefore step g) are only carried out if the continuity check reveals that the sensor device was available between the reference time (T 1...T N) of the data set (DS (T N) stored most recently in the memory device and the reactivation time (T reactivation).