Acquired by the Chicago, Burlington and Quincy in 1881. Burlington Route page 174
The C. B. & Q. did make another major acquisition during 1881. This was the so-called St. Louis, Keokuk and North Western, extending from Mt. Pleasant, Iowa, southeast to Keokuk, Hannibal, and Dardenne, where it joined the Wabash, over which it enjoyed traffic rights for thirty miles into St. Louis. This not only constituted a through route between St. Louis and the main stem of the Burlington in Iowa, but also formed part of a feasible though roundabout route between St. Louis and Kansas City. Furthermore the new property, in conjunction with the recently acquired Burlington, Cedar Rapids and Northern, could and did form part of a through line between St. Louis and St. Paul.
This road, as well as the Council Bluffs line, the Burlington and Southwestern, and the narrow-gauge St. Joseph & Des Moines were not, until much later, formally consolidated with the C. B. & Q. These, as well as some other roads, such as the Chicago and Iowa, were simply designated as Proprietary Lines, and although they were firmly controlled by the C. B. & O., they were separately managed, their figures generally not being included in C. B. & Q. totals. Thus between 1880 and 1900, the “C. B. & O.” did not technically include from 700 to approximately 1,300 additional miles of extremely important railroad that were in fact a part of the system. Quite apart from this mileage, from July 31, 1875, to September 1851 the C. B. & O. proper more than doubled—from 1,263 to 2,838 miles. Of this increase of 1,575 miles, 355 were accounted for by the St. Louis, Rock Island and Chicago, approximately 285 by Iowa branches, and about 35 by Missouri branches. The rest was made up of the Burlington and Missouri River Railroad in Nebraska, the Republican Valley Railroad, and their various branches.
(pp 174-5 Burlington Route)