A special court in Ajmer granted CBI the custody of 72-year-old Tunda, who is now in judicial custody of Delhi Police.
The court sent Tunda for a six-day police custody to CBI with an instruction to produce him before it on January 13.
Blasts took place on Mumbai Rajdhani, Flying Rani Express, Andhra Pradesh Express, New Delhi-Howrah Express and Howrah- New Delhi Express between December 5 evening and wee hours of December 6, 1993.
The cases registered by different police stations were handed over to CBI by the Centre. During its probe, the agency found that bombings were an act of common conspiracy, CBI sources said.
Concluding its probe, CBI filed its charge sheet before Tada court in Ajmer on August 25, 1994. Ten years later, special judge VK Mathur pronounced all the 15 persons facing trial guilty and sent them to life imprisonment but Tunda remained out of clutches of law enforcement agencies.
He was nabbed by Special Cell of Delhi Police from Banbasa at Indo-Nepal border in Uttarakhand last year.