On June 18, 1967, a package placed on a luggage rack in a car on the Sanyo Dentetsu line stopped at Shioya Station in Kobe exploded, killing at least one person and injuring many others. The explosive device consisted of crude gunpowder and a timer, much like a similar bomb that had exploded in a Kobe Daimaru department store five months before. There were no circumstances to suggest the crime may have had a political objective. Like the department store bomb case, It remains unsolved.

On Father's Day, June 16, 1968, the explosion of a package placed on a luggage rack in a Yokosuka line local train that was approaching Ofuna Station in Kanagawa prefecture killed one passenger and injured 14 others. This case was solved by an unproblematic police investigation. A young carpenter named Yoshinori Wakamatsu had taken inspiration from the many bombing incidents of the sixties to deal with his own unhappiness by attacking the train that his former live-in girlfriend and intended wife had frequently ridden. Wakamatsu was executed for the crime in 1975. By that time, he had converted to Christianity and produced a substantial body of poetry that won the praise of more than one literary figure, including Otohiko Kaga. A volume of poems by Wakamatsu was finally published in 1995, under the pen name Yoshiki Juntama. Kaga wrote about Wakamatsu in a book of essays and used elements of his story in his novel of the final days of a condemned man, Senkoku (Judgement).