CSRM Completion Grotto with the Model of the Jupiter

From: "Arthur Fluter" art.fluter@gmail.com

In the [California State Railroad] Museum, just past Gov Stanford, on the far site of the grotto, the display is of a tunnel portal with the date of "1910" on the keystone.

What is the significance of this date?

One Docent said it was the start of Harriman era for the SP but doesn't seem relevant to me.

The tunnel list I could find is missing many completion dates. It looks like tunnel numbers in the high tens or low candidates but I can't tell.

Anyone know the significance of a 1910 tunnel portal? ...

—Art Fluter