The best way to explore Colorado is by car. This is the fastest and most convenient way to get from city to city and to explore the backroads in the mountains. I-70 crosses the state from east to west and I-25 runs north and south. Both interstates run through the capital city of Denver.
Denver's Regional Transportation Department (RTD) has buses that connect Denver to surrounding areas such as Boulder, Colorado Springs, and much more. RTD's SkyRide provides transportation from Denver International Airport (DIA) to destinations throughout the front range. In addition to buses, RTD operates several light rail lines throughout the city. For more information on RTDs services, schedules, and fares, visit their website at http://www.rtd-denver.com/
Traveling by train is not very popular in the United States, however there are railways connecting Denver to other major cities. There is also a special ski train that takes skiers from downtown Denver to Winter Park ski resort.