CHRIS CUOMO INVESTIGATES THE RISK OF TOXIC TRAIN WRECKS ACROSS THE COUNTRY, ON ABC NEWS' "PRIMETIME," THURSDAY, AUGUST 31

Plus: A Russian Orphan Speaks Out About Being Molested By Her Adoptive Father - Who Posted Explicit Photographs of the Little Girl Online

Are trains across the country ticking time bombs? In January, 2005, when a train crashed into a small town in South Carolina, it unleashed 160,000 pounds of a deadly compound that killed nine people, injured more than 500 others, and forever changed the town. But what happened in Graniteville, SC was not an act of terrorism; it was a devastating example of what can go wrong from the millions of tank loads transporting poisonous chemicals yearly. Chris Cuomo reports on the risk of toxic train accidents in America on "Primetime," THURSDAY, AUGUST 31 (10:00-11:00 p.m., ET) on the ABC Television Network.

Last year there were an estimated 846 accidents involving trains that were carrying dangerous chemicals -- 36 of those accidents released toxic chemicals into the air. Cuomo takes viewers through the cause of the Graniteville accident, as well as other similar train wrecks, investigating whether train companies could have helped avoid the problem. According to James P. Hoffa, president of a railroad related worker union, "they (train companies) are just rolling the dice that maybe there won't be a rail wreck. Maybe we'll just get by if we go on the cheap, and that's the thinking of the industry." A spokeswoman for the train industry defends the industry's safety record. From Arkansas to North Dakota, the report looks at the safety concerns on these trains and what's being done today to address the issue.

Then: Pictures of a skinny little girl, tied up and naked, became a popular visual in cyberspace for pedophiles -- but no one knew who the little girl was nor who the person was taking and uploading the photos. For five years police helplessly watched this girl grow older on the internet, as new photos kept appearing. Finally police were able to track down the pedophile responsible for tormenting this little girl, named Masha. Masha, a Russian orphan adopted at age five by Mathew Mancuso, a 41-year-old man who molested and posted explicit photos of her online, speaks with John Quinones about her experience and why she wants others to know about what happened (the report originally aired in December 2005). The report chronicles the young girl's journey and includes recent updates with the latest on Mancuso and Masha.

Masha, who has since been adopted by another family, has continued speaking out and, in May 2006, testified before the House Energy and Commerce Subcommittee about her life and urged them to toughen penalties for those that download child pornography from the internet. "Primetime" reports on the latest outcome of a recent bill signed into law -- because of Masha -- and what the new bill will mean for internet child pornography.

DIANE SAWYER, CHRIS CUOMO, CYNTHIA McFADDEN and JOHN QUIQONES are the anchors of "Primetime." DAVID SLOAN is the executive producer.