The maps are dated June 30, 1919 and corrected up to Dec 30, 1927. The spur at 343 probably missed the first round of mapping and didn't last long enough to make it into the corrections. It seems like the map should have been changed to Dalton though if the spur near Lobato lasted until 1930 and was indeed renamed.
I found a March 1911 tax record for Frank W. Broad & Co out of Chama, NM. It shows income of $2537.60 and the special excise tax rate was 1% at the time.
The Chama Farm & Implement Co. is also on the same page with no income shown.
Dave