Grandfather Heman Coltrin and his brother John Graham Coltrin

From: "Dorothy Coltrin" dmcoltrin@comcast.net

I have been told that my grandfather Heman Coltrin and his brother John Graham Coltrin worked on the railroad and possibly are included in the photo of the laying of the spike at Promontory Point on May 10, 1869. My grandfather would have been 15 years and his brother was 26 years. Can you tell me how I might verify this information?

—Dorothy Coltrin