I would like to know if it was a studio or was it a real train that traveled around taking pictures of railroad men and there families.

On the back of the picture of a women and a man, says to grandma Canfield, the Twins Sophia and Alfred, the other one says, A. Canfield. So I am guessing its Alfred Canfield. Then the other picture has the same women and a small child. But I can't find them in the census.