Multi-use ?

Gee South Park , you work for a power company ? I used to have a few Hemingrays I "liberated" from the old D&RGW / Western Union line in the early '70s . Perhaps the crossarms with more than one line also were used by a local power company . Prior to 1946 , when the Rural Electrification Authority (REA) was formed ,most power companies were very local ,and most of the American "outback" had little or no electicity .
Perhaps the local Baker City power company used this existing line to access sevice to ranches and Sumpter .
From earlier posts by Sumpter Valley experts the SV dispatched a lot of daily train movements on their main line ,especially prior to The Second World War . A lot of Heislers were operated by the OLC .This indicates that the lumber companies may have been using the SV main line in places (Heislers could run at 20 mph , Shays only at 12 mph),so keeping an operable telephone line to Austin was probably important to the end .
An interesting factoid - I was told that Heislers were the only geared engines that the NP would allow lumber companies to use on their trackage .