Captain Jim Doucette with the Sacramento Fire Department says investigators are following up on over 100 calls to their Arson Tip Line.
"It’s just a really extensive interviewing process and hopefully we hear something soon but it may not be soon it may be still weeks or months away before they have a cause and if there is any suspects any suspects that they can identify."
Union Pacific is offering a $10,000 reward for information leading to the arrest. The March 15th blaze near Cal Expo interrupted freight and passenger train service for about 2-weeks.