Here is a list of articles pertaining to the McKeen Cars

Born Thirty Years Too Soon

An article from Railroad Magazine, January 1951, Written by William M. Schopp,

A General History of the McKeen Motor Car Company

Official Proceedings of the New York Railroad Club

A transcript between William McKeen and a few other Railroad men talking about the advantages and disadvantages of Motor Cars in service around 1915.  This article is quite long, but a very good read.

“WILLIAM RILEY McKEEN A SUCCESSFUL WORKINGMAN“

The Omaha Sunday Bee, July 12th, 1908, this article was nearly a full page on McKeen’s life and current times (full page on a newspaper that had 5 columns and was large format)

The McKeen Motor Car by C.Hughes

A article written by an engineer who at this point has run a McKeen Car for about a year or so.  He speaks more about the mechanical nature of the Motor Cars.