On the day of the derailment, all four of the police officers at Mitaka Station abandoned their posts; this was never explained.

Takeuchi's lawyer refused to allow a co-worker to present evidence affirming that he and Takeuchi were in a public bath together when the train left the station (an apparently airtight proof that at least one other person was involved), claiming it was "irrelevant to the case".

[1] In a court ruling in 1955, the judge found there was no evidence of a conspiracy, but rather that Takeuchi had planned and executed the entire incident himself.

[4][3] In 2010, an article from the Japan Times mentioned that the confession Takeuchi provided was done under duress from the police.

[1] In 2019, the Tokyo High Court denied a request to have a retrial for Keisuke Takeuchi.