Wiki has the bare bones history of George Pullman and the Pullman Porters; there are many interesting stories.

Recently published, "An Anthology of Respect, The Pullman Porter National Historic Registry," by Lyn Hughes, lists the names of the porters who worked for the company in its 101 years of operation.
The A. Philip Randolph Pullman Porter Museum in Chicago has an interesting website:
www.aphiliprandolphmuseum.com

WTTW, www.wttw.com, has an interesting article, "From Servitude to Civil Rights."
The Pullman Rail Car Company was the largest employer of Blacks in the country.