The vast majority of locomotives in the Museum are steam-powered, though diesels, compressed-air propulsion, and even the use of sails is represented. In the early days of railways, trains were commonly hauled by horses, and this survived for small-scale shunting well in to the 20th century. Other animals are much rarer...
DOGS ON THE DECAUVILLE
The Decauville railway system used light rails at a narrow gauge (usually 500 mm or 600 mm) fastened to steel sleepers. This track could be quickly laid and then taken up again. It was used extensively in the 600 mm gauge in the First World War.
Left: Decauville railway truck drawn by six dogs
DOGS ON 3-FOOT TRACK
Left: Railway truck drawn by six dogs: 1906
There is a YouTube video; it says it was taken on the Kougarok Mining District railroad tracks near Nome, on Alaska's Seward Peninsula in the 1920s.
This information relating to a picture postcard comes from Olaf Rasmussen (at 5 Jan 2019)
"The 3-foot gauge Seward Peninsula RR still existed in 1993 and I walked many miles of the long-disused railroad (no, not all 110 miles). After the end of steam operations in 1910 the railroad became a public railroad anyone could use with their own vehicles, the most popular being pup mobiles as shown on the attached photo, likely taken in the 1920s or 1930s.
The back of the picture card shows the location as Salmon Lake, 40 miles from Nome (no, I didn't hike that far- there were far too many berries to pick, plus the grizzly bear chasing a group of mooses across the valley was a bit unnerving). What the status of the narrow gauge line is today I don't know. Back in 1993 parts of the line could probably still have supported a light pupmobile."
Left: Small covered truck drawn by eight dogs: 1906?