First and foremost, aside from light average and maximum axle loads, the European systems spend a lot more per unit of traffic on maintenance than the US systems. Second, safety limits are well beyond comfortable. Third, most European turnout geometries are for the most part simpler and thus smoother than those in the US, and thus tend to be smoother riding, Fourth, because of this and other factors, internal designs and operating mechanisms are much more complex and thus more expensive to fabricate and maintain than US (along with Canadian and Mexican) designs. In general, the North American concept is rugged simplicity, and the European designs have neither.