The Midland (as it was colloquially known) was an extraordinarily difficult railroad to operate, in large part because it had very little level track. In crossing Colorado, the line made three summits - at Hayden Divide, west of Colorado Springs, at Trout Creek Pass, and at Hagerman Pass on the Continental Divide. The Hagerman Tunnel was completed in 1887. In 1891, it was replaced by the Busk-Ivanhoe Tunnel which was at a lower altitude. This shortened the line and made the grade easier, but the approaches to these summits were severe: eastbound trains faced an ascent of about twenty miles of three percent grades in the climb from Basalt to the western portal of the tunnel at Ivanhoe; westbound trains climbing out of the Arkansas River Valley faced a shorter but still difficult climb of 3.24%. The ascent from Colorado Springs to Divide was also severe, with several stretches of 4% grade and significant curvature.