Indian police have charged 30 people in connection with bombings which killed 185 people in Mumbai (Bombay) in July.
About 700 people were also wounded in the blasts
The Indian authorities allege that a Pakistani man, Azam Cheema, masterminded the devastating attacks.
Thirteen accused were in court. Fifteen others, 11 said to be Pakistani, were charged in absentia, Mr Cheema among them. Police say two suspects are dead.
India blamed the blasts on its rival, Pakistan, which denied the accusation. Talks halted but were recently resumed.
Indian anti-terrorism chief KP Raghuvanshi said the authorities had proof that Mr Cheema was the main conspirator.
He is alleged to be a commander in the Islamic militant group Lashkar-e-Toiba, which is banned in Pakistan.
India, the US and others say that despite the ban Pakistan allows the group to continue to operate under a different name.
Pakistan was quick to condemn the bombings and offered to help in the investigation. It has repeatedly invited India to substantiate its allegations of Pakistani involvement in the blasts.
Mr Raghuvanshi told the BBC that one of the suspects had died in the blasts.
The other was killed by police in an "encounter" in the city.
He said the 13 suspects who had appeared in court were all Indians - as were the four others charged in their absence.
More than 10,000 pages of charges were presented to the court in Mumbai.
The charges faced by the suspects, most of whom are Muslims, range from conspiracy and illegal possession of arms and explosives to aiding terrorist acts and waging war against the state.
"Our investigations reveal the role of Pakistan-backed terrorism, which we aim to prove before the court," Mr Raghuvanshi told the AFP news agency.
Seven explosions in quick succession shook the packed suburban rail network in the financial capital on 11 July. About 700 people were wounded.