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This study proposes a Temporal\u2010Knowledge fusion Spatiotemporal Graph Convolutional Network (TK\u2010STGCN) for early warning of faults in the traction control system (TCS). Compared with the existing literature that leverages the spatiotemporal characteristics of big data for fault feature discovery, TK\u2010STGCN focuses on integrating prior knowledge to capture correlations between data and fault mechanisms, thereby improving data processing efficiency. This requires our method not only to extract spatiotemporal features from time series but also to efficiently integrate knowledge representations with time series as inputs to the model. Specifically, structural analysis (SA) is first employed to construct the predefined structural graph for the TK\u2010STGCN backbone network. Subsequently, a knowledge fusion unit is used to integrate the knowledge graph representation with monitoring time series data as input for the TK\u2010STGCN model. Finally, the TK\u2010STGCN method is applied to provide early warnings for six common faults in TCS. Analysis based on 21,498 hardware\u2010in\u2010the\u2010loop experiments reveals that this method can achieve a fault warning rate of over 90%. 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