At Albuquerque, New Mexico, Denver Thruway connections are made daily with the Amtrak Southwest Chief. Additionally, the Ski Train operated on the former Denver & Rio Grande Western Railroad, which took passengers between Denver and the Winter Park Ski Resort, but it is no longer in service. The Ski Train made its final run to Winter Park on March 29, 2009. The service was revived on a trial basis in 2016 with a great amount of local fanfare. Further development of a mountain corridor rail option, though publicly popular, has been met with resistance from politicians, namely the director of Colorado Department of Transportation[not in citation given]. The Ski Train did return to service under Amtrak with the name "Winter Park Express" in 2017, and currently runs only on Saturdays, Sundays, and major holidays during the winter ski seasons.
Denver is in the center of the Front Range Urban Corridor, between the Rocky Mountains to the west and the High Plains to the east. Denver's topography consists of plains in the city center with hilly areas to the north, west and south. According to the United States Census Bureau the city has a total area of 155 square miles (401 km2), of which 153 square miles (396 km2) is land and 1.6 square miles (4.1 km2) (1.1%) is water. The City and County of Denver is surrounded by only three other counties: Adams County to the north and east, Arapahoe County to the south and east, and Jefferson County to the west.