Dotsero's name may be more related to surveying than to railroading.
However, there is no doubt Orestod (Dotsero spelled backwards) is related to railroading.
In 1877 Ferdinand Hayden published a survey he had made of Colorado's Western Slope.
The starting point of his survey (dot zero) was at the confluence of the Colorado and Eagle rivers.
In 1881 the Denver and Rio Grande Western Railroad started building a narrow-gauge line from Leadville, over Tennessee Pass to reach the mining areas around Aspen, Colorado before its rival railroad, the Colorado Midland, could build a standard gauge line reaching there.
The D&RG built a line through Glenwood Canyon to Glenwood Springs, finally reaching Aspen in October 1887.
It was not until 1890 that the Colorado Midland standard gauge rail line reached the confluence of the Colorado and Eagle Rivers.
In 1932, the D&RGW began construction of the Dotsero Cutoff east of Glenwood Springs to near Bond on the Colorado River, at a location called Orestod (Dotsero spelled backward).
According to the Dotsero, CO Wikipedia page, the town originated once a railroad junction was established at the confluence of the Eagle and Colorado Rivers, but it doesn't mention if the starting point of Hayden's survey was used was called Dotsero before a town existed.