It's quite significant. We run less than 7,000 feet on CP once the winter operating condition kicks in on that subdivision. We're running some trains up to 14,000 feet, so if you do the math, it's quite significant. I can't throw out all the numbers, but it really affects our ability to run long, and also it really affects our velocity. It takes a lot longer to propagate air through a train, and trains have an air-brake system. It takes hours versus minutes, in some cases, to get air through that train. It might take you 45 minutes to build up proper brake-pipe pressure in normal temperatures. That might take five or six hours at temperatures less than -25°C.
