Re: Lines "East of Sparks"
In 1910 the UP was in the process of creating the Oregon-Washington Railroad & Navigation Co. The Oregon Railroad & Navigation Company was folded into this new company, but apparently that had not been completed at the time Larry's book was produced. (As I recall, Oregon Railway & Navigation became Oregon Railroad & Navigation as a result of the late 1890s Harriman reorganization when it emerged from receivership.)
It is interesting to note in all this that the transfers of SP properties was at the operating level, specifically not the ownership level. Thus SP owned properties operated by others are called out as still being SP properties. I assume this was through a lease, much as the Central Pacific had leased and operated the Southern Pacific - Southern Division in the 1870s and early 1880s (before creation of the Southern Pacific Company). Southern Pacific - Northern Division continued to be operated by its own company.
Note my NEW address of firstname.lastname@example.org
Kyle K. Wyatt
Curator of History & Technology
California State Railroad Museum