Assertion: train's locomotive | /r/CapableOf | support the ertms train control system
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text: A rare but possible configuration has a locomotive in the middle of the train with control cars at both ends, as was, for instance, used for a time on the Brussels-Amsterdam Benelux train when there were control cars but no three-voltage (3 kV DC, 1.5 kV DC, 25 kV 50 Hz) locomotives supporting the ERTMS train control system in use on the Belgian HSL 4 and the Dutch HSL-Zuid.