Thank you for the question.
Our network is approximately 14,000 miles. On any given day, as of today, we have 58,000 rail cars moving. We have over 500 trains moving across our network in Canada and in the United States as we speak. Under regulation we are required to inspect visually every 48 hours, and we have testing equipment, including the track evaluation car that I showed you, plus other technologies, such as Sperry. Depending on the density of traffic and its location on our network, we have certain standards to which we test certain parts of our network up to once a month with these special pieces of equipment.
It's very much a combination of visual regulatory inspection combined with electronic inspection on a regular basis. Using that data, we then target our replacement and repair activities on a proactive basis.