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I agree.From Union Pacific Railroad Collection (MS-00397). The scales are noted in the drawing. The bottom corner says, "Union Pacific System. L.A & S.L.R.R. Standard Signal Maintainers & Pumpers House. Locations East Of Caliente. Ass't. Chief Engineers Office. Los Angeles. Drawn By F.W.G. Traced By F.W.G. Checked By W.V.L-B. Date. Nov. 24. 1926. Scales As Noted. Revised [not legible]. Drawing. No. 15656-C".
sod2021-016. Union Pacific Railroad Collection, 1828-1995. MS-00397. Special Collections and Archives, University Libraries, University of Nevada, Las Vegas. Las Vegas, Nevada. http://n2t.net/ark:/62930/d1g15xj37
English