Pronouncing the sentence, Judge V S Tripathi observed that the case fell in the rarest of rare category and as such the convicts were entitled to the severest punishment.
The blast occurred in a general coach of the train between 9.30am and 10am when it was on its way to Ujjain from Bhopal, Railway PRO, Indore, Jitendra Kumar Jayant said.
The quantum of punishment will be pronounced by the special NIA court on Monday, a spokesperson of the federal agency said.
The perpetrators of Bhopal-Ujjain train bomb explosion were influenced by Islamic State ideology and the incident was a "trial blast" as the terrorists planned to carry out more attacks, the Madhya Pradesh government said on Wednesday.
NIA officials will interact with Madhya Pradesh police personnel and verify leads available with them to ascertain whether the explosion was a terror attack.
Home Minister Rajnath Singh also said that the National Investigation Agency would probe the cases, including the Lucknow encounter in which an alleged terrorist linked to a train blast was killed.
At least ten people were injured, three of them seriously, in the blast in the Bhopal-Ujjain passenger train near Jabdi station of Shajapur district in Madhya Pradesh on Tuesday.
Sartaj said that what his son did was "not in the country's interest". "We will not accept the body of an anti-national," he said.
Police on Thursday arrested a former India Air Force employee who they believe is the "mastermind" of a terror module that included Saifullah, a suspected terrorist killed in an encounter on Wednesday.
IG ATS Aseem Arun confirmed that the slain terror suspect was an active member of the ISIS.
The suspect was hiding in a house in Kakori area. The densely populated neighbourhood was cordoned off and at least 20 commandos were involved in the operation, police said.
'We could crack IM modules in the country because one arrested member would spill beans on the other.' 'With ISIS, every module is different and is possibly being handled by different operators abroad.'