The victims - a train conductor in his 20s and two male passengers aged in their 20s and 70s - were taken to hospital on Sunday with non-life threatening injuries, Tetsuya Sakagami from a nearby fire department told AFP.
The 37-year-old male suspect was armed with three knives when he was arrested at Rinku Town station in the Osaka region, local police said.
He was arrested for attempted murder and has already admitted to carrying out the attack on Sunday morning, police said, adding they were still investigating the motive.
Violent crime is rare in Japan, which has a low murder rate and some of the world's toughest gun laws.
AMK/PR
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