LOUISVILLE, KY (WAVE) - For the first time, officials with the Louisville Zoo allowed media access to the site of Monday afternoon's derailment. Up close, you could easily see how the wheels of the train separated from the train cars themselves.

Inspectors from the Kentucky Department of Agriculture continue to try and piece together how the entire train tipped over, which sent 17 children and several adults to the hospital.

"Of course, you know people are understandably concerned. They want to know what happened," said Ted Sloan with the Kentucky Department of Agriculture. "That's why we're going to conduct a painstakingly thorough investigation to do everything we can to get to what happened and why."

Sloan says the driver of the train Monday was 18-years-old, the minimum age required by state law. He also said the ride had been inspected Monday before the zoo opened. "The 2008 law also requires the ride operator to inspect the ride and test it daily before it is open to the public and it's my understanding that that inspection did take place yesterday."

The train also had a state-required inspection and passed back on January 22. Until the investigation is complete, state inspectors say they will remain tight-lipped on their findings. "We'll continue to do that as long as necessary to get the facts we need to determine exactly what happened," said Sloan.

According to zoo officials, the zoo has an internal certification process to train its drivers. Every day, the operator has to run through a 35-point checklist. In addition, each week the maintenance staff does an 18-point checklist and once a month the entire track is inspected, also by maintenance staff.

At last check Tuesday night, two children were still being treated for their injuries at Kosair Children's Hospital. One of those victims, a two-month-old boy, is expected to be released Wednesday. A 21-month-old girl is still listed in serious condition. Three adults remained under care at University Hospital.