Series: 1. Correspondence
Scope and Content Note: Comprised of research requests and letters to other enthusiasts, collectors, historical societies or museums. The files date largely from the 1980s and 1990s.

Cox, Harold

Gloff, George

Hennick, Louis

Historical Societies re: Copies

Lane, Sam re: Wisconsin Electric Power Company

McCarthy, Ken

Nedden, William

Prentice, John

Research Requests

Starbuck, Jim

Stevens, John

Street Railway Projects

Yater, George

Series: 2. Photographic Material
Scope and Content Note: Comprising most of the collection, these photographs are largely slides of rolling stock, streetcars, buses, stations and barns, and equipment. Each file folder listed below corresponds to an original slide container, and slides remain in their original order. The file folder heading provided below is Mueller's own primary label, and appears to reflect a general topic or grouping of the images. Mueller used two numbering systems; the primary system is reflected by the box number given in parentheses in the list below. (The physical order of the files also reflects this primary numbering scheme.) A secondary numbering scheme was sometimes apparent, and is reflected in the number in the file folder heading (e.g., the 3 in "Utility 3"); its meaning is unknown. For image detail, researchers are advised to consult both the original container label (when it survived) and the notations found on most slides.

Photographs appear to have been collected by Mueller between the 1970s and early 1990s. Prints are often original images, and date from the early twentieth century. Slides, however, appear to date from mid-twentieth to late-twentieth century and most are thought to be copies from other sources.

Subseries: Prints

Buses, Traincars (possibly family photographs)

C&NWRailway - Third Ward Roundhouse First Trick Force

"Milwaukee Photo Album"

Miscellaneous

Out of State Railroads

Photo Logs

Postcards

Racine

"Scrapbook"

Unidentified Album

Waukesha Scrapbook

Wisconsin Gas and Electric Company Explosion of February, 1921

Subseries: Slides

Burlington Line (Box 50)

Bus (Box 79)

C.S. PSB (Box 69)

Car Barns (Box 76)

Cream City Railway (Box 13)

Early TM and Pre-TM (Box 71)

I.U. 1 (Box 47)

I.U. 2 (Box 31)

I.U. Line - Waukesha (Box 82)

I.U. Lines (Box 64)

I.U. Lines 1 (Box 16)

I.U. Lines 2 (Box 11)

I.U. Lines 3 (Box 44)

I.U. Lines 4 (Box 45)

I.U. Lines 5 (Box 46)

I.U. Lines 6 (Box 43)

I.U. Lines 7 - Hales Corners Lines (Box 81)

I.U. Lines 8 (Box 36)

I.U. Lines 8 (Box 37)

I.U. Lines 9 (Box 53)

I.U. Lines 9 (Box 54)

I.U. Lines 12 (Box 48)

M. No. (Box 78)

Milwaukee City Railway 1860-1890 (Box 12)

Miscellaneous 1 (Box 65)

Motor Bus 1 (Box 85)

Motor Bus 3 (Box 14)

Motor Bus 4 (Box 18)

Motor Bus 5 (Box 25)

Motor Bus 6 (Box 2)

Motor Bus 7 (no box number)

Motor Bus 8 (no box number)

Motor Bus A (Box 1)

MRT to Watertown (Box 75)

OO Town / St. Railway MFG / St. Railway History (Box 77)

Phantoms Advance Cars 200 (Box 80)

Rapid Transit 3 (Box 62)

Rapid Transit 4 (Box 63)

Rolling Stock (Box 115)

Sheboygan/Appleton (Box 68)

South Shore Lines (Box 114)

Special 4 - Bus Wrecks (Box 7)

Stations 1 (Box 5)

Stations 2 (no box number)

Stations 3 (Box 51)

Stations 4 (Box 29)

Stations 5 (Box 52)

Stations 6 (no box number)

Statrions 7 (Box 28)

Stations 8 (Box 26))

Stations 9 (Box 30)

Stations 10 (Box 27)

Streetcars 1 (Box 15)

Streetcars 2 (Box 6)

Streetcars 3 (Box 4)

Streetcars 4 (Box 21)

Streetcars 5 (Box 19)

Streetcars 6 (Box 24)

Streetcars A (Box 35)

Streetcars B (Box 8)

Streets (Box 9)

Streets (Box 10)

Streets (Box 17)

Streets (Box 32)

Streets (Box 34)

Streets (Box 41)

Streets (Box 84)

Streets 5 (Box 74)

Streets Modern (Box 20)

Streets Modern (Box 22)

Streets Modern (Box 23)

Streets Modern (Box 38)

Streets Modern (Box 39)

Streets Modern (Box 40)

Streets Modern (Box 42)

Streets Modern (no box number)

Trackless 1 (no box number)

Trackless 2 (no box number)

Trucks and Autos and Miscellaneous Bus (Box 73)

Unidentified (Box 111)

Unidentified (Box 67)

Unidentified (Box 72)

Unidentified (no box number)

Unidentified (no box number)

Utility (Box 58)

Utility 1 (Box 57)

Utility 2 (Box 59)

Utility 3 (Box 55)

Utility 4 (Box 60)

Utility 5 (Box 61)

Utility 6 (Box 3)

Utility 7 (Box 56)

W&S (Box 116)

Watertown Line (Box 70)

West Side Railway (Box 49)

Wrecks 1 (no box number)

Wrecks 2 (no box number)

Wrecks 3 (no box number)

Series: 3. Research and Manuscripts
Scope and Content Note: This series includes Mueller's research files and manuscript writings on urban public mass transit and the street railway industry including local railway lines, routes and stocks; the horse-drawn railways; George Francis Train; and the Milwaukee Electric Railway & Light Company. Also included are compiled rosters, and Mueller's extensive index of the Milwaukee Journalnewspaper between 1882 and 1897 and the Milwaukee Sentinel newspaper between 1856 and 1893. While a few notebooks appear to date from the late 1960s, the majority of the files were created in the 1980s and early 1990s.

The American Horse-Drawn Streetcar and Milwaukee: Converging Evolutions, Manuscript

Appleton Electric Street Railway Company

Articles and Unidentified Manuscripts

Chronology of Electric Street Railway Development, Personal Notes

Early Electric Street Railways, Personal Notes

Horse-Drawn Streetcars of America, and Horsecars of Milwaukee: 1860-1890, Manuscript

Horse Railways

Manuscript

Research

Rosters

Horsecar and Rolling Stock Inventories

List of American Street Railways in 1860, compiled by Mueller

Milwaukee and Whitefish Bay Railway Company

Milwaukee Electric Railway & Light Company

Car Construction and Statistics

Cold Spring Shops

Corporate History

Correspondence, copies of

Electric Trucks, etc.

Memories, 1966, by William F. Nedden

Milwaukee Technical League Papers

Milwaukee Journal Index

Milwaukee Northern Railway Company

Milwaukee Sentinel Index

Milwaukee Street Railway and Predecessors: A Rolling Stock Roster 1860-1896, Draft

Milwaukee Street Railway Rolling Stock Rosters

Milwaukee Transportation Milestones Project

Notebooks

Notecards

Notecards, Index of Incorporations

Predecessors of Wisconsin Electric Power Company

Proposal for a Classification System of Rolling Stock on North American Urban Railways

Racine Gas and Light Company Correspondence

Racine-Kenosha Line

Research and Notes, Miscellaneous

Rolling Stock Identification Project, "Mass Transit Project"

Routes and Line Histories

Train, George Francis

Article, manuscript

Research

Slide Presentation

Waukesha Beach Line

Wisconsin Power and Light Company (Sheboygan Division)

Wisconsin Rolling Stock Acquisition and Disposal, 1900 Roster

Wisconsin Traction, Light, Heat and Power Company (Appleton)

Series: 4. Ephemera and Collectibles
Scope and Content Note: This small group of items includes various brochures, postcards that appear to date from the turn of the twentieth century, and some booklets and timetables printed in the mid-twentieth century

East Troy Trolley Museum

Historical Brochures, Milwaukee Area

Milwaukee Transport Company: Brochures, Tickets, Timetables and Maps

Milwaukee Transit Guides and Timetables

Postcards

Railway Brochures and Ephemera

Wisconsin Utilities Association Transportation Section Essay Contest Booklets