|U&N RR train, Beaver Canyon, Idaho, ca 1885.|
Idaho Museum of Natural History.
The U&N RR first completed its line across eastern Idaho and into Montana in 1879-1880. The company had made an early decision to run narrow gauge. Narrow gauge railroads are much cheaper to build than standard gauge, especially in mountainous country. Clearly, crews have to move less material to make cuts, fills, and tunnels, and to lay the road bed. Plus, bridges don’t have to be as wide. Less obviously, narrow gauge trains can turn through tighter curves. This allows the tracks to bend around obstacles that would have to be removed for standard gauge.
However, narrow gauge trains carry a smaller payload, and they are (obviously) incompatible with standard gauge systems. Both the Union Pacific and the Oregon Short Line railroads ran standard gauge. Thus, goods moving between the systems had to be bodily transferred from one to the other. Operators had some tricks to improve the process, but it still added time and expense to all their shipments.
The problem became more acute as shipping volume rose. In 1886, the line purchased ten new engines from the Brooks Locomotive Works. These more powerful machines weighed a third more than the U&N's older stock, and over-stressed the lighter narrow gauge rails, particularly on some curves.
|Brooks-built steam locomotive, ca. 1890.|
Grant County [Oregon] Historical Museum.
To prepare for the conversion to standard gauge, management dispatched crews to widen the roadbed, including all the cuts, fills, and bridges. In some areas, new bed had to be laid to straighten out curves too tight for standard-gauge trains. Workers performed most of these tasks while regular train service continued.
The next step had to be completed in small stages. One team moved along a segment of old line, tearing up the light narrow-gauge rails and short ties. Behind them, another group laid full-length ties and the new, heavier rails. They would fully anchor one rail, while the other got just enough spikes for short-term operation. This had to be completed before the next scheduled train came through.
Next, however, they had to complete the actual switch from narrow to standard width all at once, to avoid a major interruption in service. Hence, on July 24, the U&N gathered enough crews to change the entire line after the last scheduled train passed over the narrow gauge track.
Records indicate that the conversion began at 2:00 o'clock the next morning: pull spikes, move rail over, drive new spikes, then on to the next rail. The whole job was done by the early afternoon of July 25, with no break in service.
As soon as reports reached Pocatello that the first section was done, the Superintendent of the Idaho Division started north with a short special train (Idaho Register, Idaho Falls, July 30, 1887).). The changeover was then celebrated with stops at each station along the way.
|Merrill D. Beal, Intermountain Railroads: Standard and Narrow Gauge, Caxton Printers, Caldwell, Idaho|
|George Woodman Hilton, American Narrow Gauge Railroads, Stanford University Press (1990).|
|Alex Hyslop, “Terrifying Tale of a Killer Steam Engine,” Pocatello Tribune (March 20, 1900).|