(S (S (BASENP (NNP London) (NNP Underground)) (VP (VP (VP (VBD declared) (BASENP (DT a) (QT (DQL `) (BASENP (NN code) (NNP Amber)) (DQR ')))) (PP (IN within) (BASENP (NNS minutes)))) (COMMA ,) (S (VP (VP (VP (VBG moving) (BASENP (NNS trains))) (PP (TO to) (BASENP (NNS platforms)))) (CC and) (VP (VBG opening) (BASENP (DT all) (NNS doors))))))) (PERIOD .))