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Estrada de Ferro Principè Do Grao Para #6 -  c/n 7760 -  Leopoldina, Brazil - BLW trial date: 12/19/1885 - BLW class: 5-18A-1 - named "Gurjäo".  The railway later became part of the Leopoldina Railway system.   
photo & data source: "Brazilian Steam Album - Volume III - Up Over the Hill" by  Carlheinz Hahmann -
Provided courtesy of Duccio Baldassini of Firenze, Italy
Estrada de Ferro Principè  do Grao Para #7 - Petropolis Incline, Brazil - metre-gauge - built 1888-89 - gear ratio ca. 1:2.3.  The maximum gradient on the railway was 15%.   The railway later became part of the Leopoldina Railway system. 
photo & data source: "Zahnradbahnen der Welt" [Cog Railways of the World], by Walter Hefti <> photo by Baldwin Locomotive Works 
Provided courtesy of Christian Halpaap of Hohenhameln-Bruendeln, Germany
Leopoldina Ry #13 - s/n 15230 -  Leopoldina, Brazil - BLW trial date: 03/03/1897 - BLW class: 5-20A-3 -
Walschaerts valve gear - named the "Adolpho de Figuriredo" - photo by Baldwin Locomotive Works 
photo & data source: "Brazilian Steam Album - Volume III - Up Over the Hill" by  Carlheinz Hahmann - photo:  C.S. Small collection
Provided courtesy of Duccio Baldassini of Firenze, Italy
 Madison and Indianapolis Railroad - Madison, Indiana -  built in 1847 - the railroad operated on a 17% incline above the banks of the Ohio River near Madison.  The eight wheeled locomotive used a combination of 4 cylinders for power.  Two powered the eight wheels via connection to a side rod in an arrangement similar to a conventional "rod" locomotive  The remaining two were vertically mounted on the upper midsection part of the boiler.  This pair powered a cog gearing mechanism which meshed with a gear-toothed rack that ran between the rails.   
More...
Image & data source: "Illustrated Catalog of Baldwin Locomotives - Burnham, Parry, Willams & Co., Philadelphia" - Bishopsgate Press Ltd., London 1983 
Provided courtesy of Christian Halpaap of Hohenhameln-Bruendeln, Germany

Manitou & Pike's Peak Ry - "Pike's Peak" -   taken during or before 1893 - with original gearing and cylinders - standard gauge.  

The original gearing mechanism for the first three locomotives purchased used a gearing system that incorporated three cog gears.   The operating qualities of this mechanism proved unsatisfactory.  Also, the cogs were prone to fracture.  In 1893 all three locomotives were returned to Baldwin for rebuilding.  Both the frames and the the drive mechanisms were replaced.  The new mechanisms used a balancing levers and only two cog gears. 

The drawing details the 3 cog drive mechanism.
Photo & data source: Zahnradbahnen der Welt [Cog Railways of the World], by Walter Hefti, Basel [Switzerland], 1971.
Provided courtesy of Christian Halpaap of Hohenhameln-Bruendeln, Germany

Sant' Ellero - Saltino (Vallombrosa) Cog-wheel Ry #1 -  Saltino-Vallombrosa, Italy - guage 1000mm (one meter) 1 -  built 1892 - maximum gradient 22% - 2 carrying axles - 1 cog wheel - gear ratio ca. 1:2. 2   The locomotive is named "Chimirri" after the Agriculture Minster that promoted the railway's construction. 1

1Upper photo: Taken March, 1903 near the station at 1000 meters above sea level.  The man standing on the ground in uniform is inspector ("headtrain")  Bertuzzi.   The man standing on the ground in uniform is inspector ("headtrain") Bertuzzi. In the cab on the left is fireman ("fire adept") Egidio Papenti, and on the right is conductor Giovanni Occhietti.  The round signal in the photo is for "crossroad with a dead-end rail for load goods".  The railway served tourists, postal service and a local wood industry.  The photo was made by Basilio Domenichetti for a guide of Saltino-Vallombrosa a world famous , at the time, climatic station also called "Italian Swiss".    Note the rack above the rail top.  ||  Photo and data provided courtesy of Duccio Baldassini of Firenze, Italy

2Lower photo & ..data source :  "Zahnradbahnen der Welt" [Cog Railways of the World], by Walter Hefti - photo by Baldwin Locomotive Works 
Provided courtesy of Christian Halpaap of Hohenhameln-Bruendeln, Germany
Sant' Ellero - Saltino (Vallombrosa) Cog-wheel Ry #2 -  Saltino-Vallombrosa, Italy - gauge 1000mm (one meter) - built 1892 - named "Vallombrosa"  

Upper photo: The diamond stack was installed during WW I when the railway had to use lignite due to a local shortage of coal.  Taken by the "SOCIETA' ANONIMA FERROVIA S.ELLERO - SALTINO (VALLOMBROSA" in 1915.

Lower photo:  The man dressed in white, standing in the foreground is Virgilio Caglieri who was the "head of warehouse" of Sant' Ellero. Taken by the "Society of the Railway" in 1914-15 at the Sant' Ellero station, prior to the installation of the diamond stack.

Photo and data provided courtesy of Duccio Baldassini of Firenze, Italy

Sant' Ellero - Saltino (Vallombrosa) Cog-wheel Ry #3 -  Saltino-Vallombrosa, Italy - gauge 1000mm (one meter) - built 1893 - named "Roma" - Vauclain compound cylinders.  The compound cylinders did not prove as powerful as the railway had hoped when the locomotive was acquired.    The 1905 photo was taken at the Sant'  Ellero station by the  ""SOCIETA' ANONIMA FERROVIA S.ELLERO - SALTINO (VALLOMBROSA".

Photo and data provided courtesy of Duccio Baldassini of Firenze, Italy

 

 

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