In July 2014, The World Bank reported that the per kilometer cost of California's high-speed rail system was $56 million, more than double the average cost of $17–21 million per km of high speed rail in China and more than the $25–39 million per km average for similar projects in Europe. High real estate prices in California and three mountain ranges to cross contribute to the difference. For example, Construction Package 2-3 in the farmland of the flat Central Valley works out to $11.4 million per km, although this figure does not include electrification or property values, so it is roughly comparable internationally. Furthermore, the proposed High Speed 2 in Great Britain is estimated to be more expensive on a per mile basis than the Californian system.