The presidential aspirant did not immediately mention the source of his figure, although his supporters said he might have relied on security sources with knowledge of the incident.
The Kaduna-bound train was attacked on Monday.
The lawmakers asked why decisive actions are yet to be taken against bandits’ months after being declared terrorists.
Ibrahim Wakkala was shot during a crossfire between the military and the bandits who attacked the train.
After sustaining gunshot wounds, Chinelo Megafu said on Twitter she was aboard the train and urged fellow citizens to pray for her recovery.
A KADSEMA official who did not want his name mentioned said they were still working on the details.
The transport minister said the tracks, repaired by Nigerian engineers, would be operational tomorrow.
Mr Buhari had last week said he is prioritising the building of railways because of the bad conditions of roads in the country.
“Concerned that ticket racketeering, which the e-ticketing system sought to eradicate, is still going on unabated.”
The Buhari administration places high hopes on its passenger rail project, but constant mishaps are hampering proposed benefits to Nigerians.
