EMU	Electric Multiple Unit
EMU-ODS	Electric Multiple Unit Onboard Detection System
TADS	Trackside Acoustic Device System
RNN	Recursive Neural Network
LSTM	Long Short-Term Memory
MLSTM	Multilayer Long Short-Term Memory
iForest	Isolation Forest
MLSTM-iForest	Multilayer Long Short-Term Memory–Isolation Forest
WTDS	Wireless Transmit Device System
RMSE	Root Mean Square Error