In a hearing at the Old Bailey, he was told his trial would begin on 5 March.
A homemade bomb partially exploded in a train at Parsons Green station on 15 September, injuring 30 people.
It is alleged that the defendant built and placed an improvised explosive device on a train which then partially exploded at or near Parsons Green station.
The 18-year-old appeared briefly via prison video link and remains remanded in custody.
He will next appear at the Old Bailey on 19 January for a plea and case management hearing before his trial in March.