(S (S (PP-SBJ (NP (PP (PP (BASENP (NN 衝突) (NN 時点)) (IN で)) (IN の)) (NP (PP (BASENP (NN 列車)) (IN の)) (NN 速度))) (IN は)) (COMMA 、) (VP (ADVP (ADVP (NN すぐ) (INRB に)) (IN は)) (VP (VP (VBO 知らさ) (VP (VBV れ))) (VP (MDV なかっ) (VP (MD た)))))) (PERIOD 。))
衝突 時点 で の 列車 の 速度 は 、 すぐ に は 知らさ れ なかっ た 。
Train speed at the time of the crash was not immediately known .