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The rolling stock of Line D with its driverless vehicles is outlined and the system of corrective maintenance is introduced as a 'toolbox' for the repair engineers, with a second-generation expert system for fault diagnosis, a robot dialogue module and a module for consultation of electronic documentation. The functional and structural decomposition of the diagnostic aid is explained in more detail. Alarms provided by the rolling stock are taken into account in the reasoning which produces a display of suspect subcomponents in order of plausibility coefficients. A knowledge editor enables the maintenance engineers to change the data without needing to know the model encoding approach. The system is programmed in Nexpert Object under MS-Windows 3.0.. Operational use was due to begin in Sept. 1991.