The New Mexico Rail Runner Express is a single line commuter rail that connects Albuquerque and Santa Fe. This part of New Mexico is home to about half of the state's population, and options to expand the interstate highway between the two cities are limited, prompting officials to consider other options for travel in this corridor. The line currently has 15 stations and nearly 3,000 riders each weekly. The line is owned by NMDOT and operated by Rio Metro and Herzog Transit Services.