Original caption: "ENTRANCE TO MARSHALL FIELD &amp; COMPANY'S TUNNEL BASEMENT, SHOWING TYPE OF ELECTRIC MOTOR USED".  This photo also appears in Bruce Moffat, Forty Feet Below, Interurban Press, 1982, page 27, with the caption: "... Jeffrey Locomotive 130, looking toward State Street just after the floor was lowered to meet the tunnel grade."  This photo is obviously posed -- there are no overhead wires in place yet to power the locomotive.
No attribution.  Photo probably provided by <a href="https://en.wikipedia.org/wiki/Chicago_Tunnel_Company" class="extiw" title="en:Chicago Tunnel Company">Illinois Tunnel Company</a> or from <a href="https://en.wikipedia.org/wiki/Marshall_Field%27s" class="extiw" title="en:Marshall Field's">en:Marshall Field's</a>.
Chicago's Great Subway System, <a rel="nofollow" class="external text" href="https://archive.org/stream/chicagogreatcent321906chic#page/64/mode/1up">Chicago -- the Great Central Market</a>, Vol. 3, No. 2 (Apr. 1906); page 64.