infrastructure, is it? >> that is correct. the northeast corridor tracks are very old. some of the infrastructure was built in the 1930s. it was renewed in the 1970s and early 1980s. so there is infrastructure work that needs to be done. but it does not appear that infrastructure problems played a role in this particular derailment. >> and, steven, a lot of people are looking to the train engineer you now for answers to a lot of questions. but how does amtrak screen their engineers before they start work? what sort of training, safety training do they go through? >> most of the time, amtrak hires people as engineers from within the company. people who have been around the trains and who understand how the trains operate. they've run through an extensive