At a news conference Tuesday, police released sketches of two suspects and showed reporters two bottles of kerosene and a small digital clock recovered from the scene of the attack.
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News reports earlier in the day said one person has been detained in connection with the attack.
Pakistan and India have condemned the bombing, but said it will not affect the peace process between the two countries.
Pakistan's foreign minister says he will go ahead with his planned visit to India Tuesday for peace talks.
Khursheed Kasuri is expected to meet with Indian officials in the capital, New Delhi.
Pakistani President Pervez Musharraf said the attack would stiffen leaders' resolve to reach a sustainable peace. Indian Prime Minister Manmohan Singh vowed that the culprits would be caught.
The United Nations, the United States and the European Union also condemned the attack. U.N. Secretary-General Ban Ki-moon said it was a heinous crime that can not be justified.
Two bombs exploded on the train around midnight Sunday. Two carriages were quickly engulfed in fire and victims were trapped by locked doors and barred windows.
India's railways minister Laloo Prasad Yadav said two unexploded suitcase bombs found later directly pointed to terrorism. Most of the victims were Pakistanis although some Indians were also killed.
Some information for this report was provided by AFP.