Student Damon Smith, who has a form of autism and an obsession with weapons, left the bomb in a backpack on a crowded train in October.
The abandoned bag was spotted by two members of the public who handed it to the driver, who in turn raised the alarm when he saw wires sticking out.
Smith was convicted for possession of an explosive substance with intent and sentenced to 15 years in a young offenders' institution, a type of prison.
Judge Richard Marks said there was no "clarity or certainty" as to the motivation for Smith, who was interested in Islam but denied being an extremist.
"The seriousness of what you did cannot be overstated, not least against the background of the fear in which we all live from the use of bombs here and around the world, an all too timely reminder of which were the events in Manchester earlier this week," Marks said.
Suicide bomber Salman Abedi killed 22 people and injured dozens more on Monday when he detonated a device outside one of the exits of the 21,000-capacity Manchester Arena after a pop concert.
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