In collaboration with John F. Due, The Electric Interurban Railways in America (Stanford: Stanford University Press, 1960), xii + 463 pp. (London: Oxford University Press, 1960), 76 s. (Second printing with revisions and additions, 1964.)
The Truck System (Cambridge: W. Heffner and Sons, Ltd., 1960) xii + 166 pp., 21 s. (Westport, CT: Greenwood Press, 1975).
The Great Lakes Car Ferries (Berkeley: Howell-North Books, 1962), xvi + 282 pp.
The Ma & Pa: A History of the Maryland & Pennsylvania Railroad (Berkeley: Howell-North Books, 1963), vii + 183 pp. (Second edition, San Diego: Howell-North Books, 1980), xii + 220 pp.
The Night Boat (Berkeley: Howell-North Books, 1968), 271 pp.
The Transportation Act of 1958 (Bloomington and London: Indiana University Press, 1969), x + 262 pp.
The Cable Car in America (Berkeley: Howell-North Books, 1970), 484 pp. (Revised edition, San Diego: Howell-North Books, 1982). The revised edition is to be reissued by Stanford University Press, 1997.
In collaboration with Joseph Jobe and Russell Plummer, French edition: Bateaux a Roues d'Europe et d'Amerique; German edition: Raddampfer in Europa und Amerika (Lausanne; S.A., 1976), 216 pp. English edition: The Illustrated History of Paddle Steamers (New York: The Two Continents Publishing Group, Ltd., 1976), 188 pp.
Monon Route (Berkeley: Howell-North Books, 1978), 323 pp. Reissued by Heimburger House, 1996.
American Narrow Gauge Railroads (Stanford: Stanford University Press, 1990), xvii + 580 pp. Issued in paperback,1994.
Eastland: Legacy of the Titanic (Stanford: Stanford University Press, 1995). Issued in paperback, 1996.
Lake Michigan Passenger Steamers, in preparation.
J. Bucknell Smith, A Treatise Upon Cable or Rope Traction as Applied to the Working of Street and Other Railways (1887), (Philadelphia: Owlswick Press, 1977), xxii + 200 + xii pp.
The Annotated Baseball Stories of Ring W. Lardner 1914-1919, (Stanford: Stanford University Press, 1995), xiv + 631 pp. Issued in paperback, 1997.
Ben Hecht and Charles MacArthur, The Front Page, completed.
Cable Railways of Chicago (Chicago: Electric Railway Historical Society, 1954), 44 pp.
The Toledo, Port Clinton and Lakeside Railway (Chicago: Electric Railway Historical Society, 1964), 60 pp. (Reissued by Montevallo Historical Press, 1997.)
The Staten Island Ferry (Berkeley: Howell-North Books, 1964), 64 pp.
Federal Transit Subsidies: The Urban Mass Transportation Assistance Program (Washington: American Enterprise Institute, 1974), 131 pp.
The Northeast Railroad Problem (Washington, American Enterprise Institute, 1975), 59 pp.
Amtrak: The National Railroad Passenger Corporation (Washington: American Enterprise Institute, 1970), 80 pp.
Nellie Farren (Saffron Walden, Essex: Sir Arthur Sullivan Society), in preparation.
