(S (S (S (BASENP (NNS Trains)) (VP (VP (VBD were) (RB not)) (VBN stopped))) (CC but) (S (BASENP (DT the) (JJ two-minute) (NN silence)) (VP (VBD was) (VP (VP (VBN announced) (CC and) (VBN marked)) (PP (IN through) (NP (DT the) (NP (BASENP (NN underground) (CC and) (NN overground)) (NNS services)))))))) (PERIOD .))