It usually had to do with the convenience to the Southern Pacific. For example bridge tenders were there to put out fires on the bridge. By living next to the bridge the bridge tender could go out on the bridge to put out fires caused by sparks from the steam engine right after the train crossed over the bridge.
Station agents were often provided quarters over the depot. That way they were available when ever they were needed at the depot, even after hours.
union pacific
The last golden railroad spike is at Promontory, Utah May 10, 1869,as the Union Pacific Tracks joined the Central Pacific railroad tracks
The Central Pacific Railroad (CPRR) was a transportation means built from California to Utah between 1863 and 1869. The CPRR was the western part of North America's First Transcontinental Railroad. The CPRR's tracks met with Union Pacific tracks in Promontory, northern Utah, on May 10, 1869.
If this question refers to the US's transcontinental railroad, then the answer is Promontory Point, Utah. There in the Spring of 1869, the Union Pacific and Central Pacific railroads met, creating the US's transcontinental railroad.
It is an excellent rural site for the Union Pacific to establish a siding.
There are a lot of railroad tracks in South America.
acheiving monopoly in hauling freight along their railroad's tracks
On May 10, 1869, Central Pacific and Union Pacific Railroad met at Promontory Summit, UT with 1,800 miles of new tracks laid.
There are 7,021 miles of railroad tracks currently in Egypt
Trestles
The Federal government paid the two railroad companies that built it by granting them sections (one square mile) on alternating sides of any tracks that they built. The railroad companies could do whatever they wanted with this land and often sold it off. Many other western railroads were later funded the same way.
train tracks or a railroad