(S (S (S (BASENP (DT The) (NN train)) (VP (VP (VBD was) (PP (IN in) (BASENP (JJ south) (NNP Chicago)))) (S (VP (VBG heading) (PP (IN towards) (NP (BASENP (PRPD its) (NN destination)) (PP (IN of) (BASENP (NNP Chicago) (NNP Union) (NNP Station))))))))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN crash)) (VP (VBD occurred) (NP (BASENP (RB around) (NN 17:30)) (BASENP (NN UTC))))))) (PERIOD .))