George B. Trumbull's ink/watercolor locomotive drawings

Is anyone familiar with "George B. Trumbull's ink/watercolor drawings of train engines"? We have received an inquiry from a person who has three of them and would like to know a little more about him.

The following website shows a "George B. Trumbull ... Group of studies of seven American locomotives of the late 19th Century ... Both passenger and freight locomotives ... various railways ... 1895-96, ... Pen and ink, watercolor on paper, 7 1/2 x 17 inches ... "