(S (S (S (BASENP (DT The) (NN accident)) (VP (VP (VBD took) (BASENP (NN place))) (PP (IN at) (NP (BASENP (RB approximately) (NN 20:55)) (BASENP (NN GMT)))))) (SBAR (WHADVP (WRB when)) (S (NP (BASENP (DT the) (NNP Class) (NN 220/221) (NN train)) (PRN (COMMA ,) (VP (VBG traveling) (PP (IN at) (ADVP (RB close) (PP (TO to) (BASENP (NN 100mph)))))) (COMMA ,))) (VP (VBD hit) (NP (BASENP (DT the) (NN car)) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (PP (IN on) (BASENP (DT the) (NNS tracks))))))))))) (PERIOD .))