Because of the restricted loading gauge of the tunnels and the need for the tubs to be small enough to be pushed by one man, these railways were almost all narrow gauge.
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The gauge, know as “standard gauge” (4' 8.5?) is standard throughout much of Europe, though the US and Russia use wider gauges. Many former colonial countries use a narrower 3'6? gauge, however.
American trains are typically longer and wider to accommodate more freight, while European trains are shorter and narrower to allow for more nimble movements and quicker acceleration.
Narrow gauge railroads tend to cost less to build, but may have lower weight limits. Standard gauge lines may cost more initially, but typically weight limits will be higher.
If locomotives were imported from elsewhere, especially in the early days, the track would be built to fit them. In some cases standard gauge was adopted, but many countries or companies chose a different gauge as their national gauge, either by governmental policy, or as a matter of individual choice.
Since the chariots were made for Imperial Rome, they were all alike in the matter of wheel spacing. Therefore, the United States standard railroad gauge of 4 feet, 8.5 inches is derived from the original specifications for an Imperial Roman war chariot.
While the US was a passenger train pioneer in the 19th century, after WWII, railways began to decline. The auto industry was booming, and Americans bought cars and houses in suburbs without rail connections. Highways (as well as aviation) became the focus of infrastructure spending, at the expense of rail.
Rail systems are so popular in Europe because they can get loads of passengers to their respective destinations en masse — with much less of an impact on the environment. National governments, looking to reduce carbon emissions and put pro-environmental policy into practice, subsidize or own entire rail networks.
The erstwhile Great Indian Peninsula Railway introduced a broad gauge of 1,676 mm (5 ft 6 in) for the first passenger railway line in India, between Bori Bunder and Thane. This was later adopted as the standard throughout the country, as it was thought to be safer in areas prone to cyclones and flooding.
Nationalisation. From the start of 1948, the big four were nationalised to form British Railways (latterly British Rail) under the control of the British Transport Commission. Although BR was a single entity, it was divided into six (later five) regional authorities in accordance with the existing areas of operation.
The growth in train overcrowding is largely attributed to increased passenger demand, and the 'walk-up' nature of British railways, in which seat reservations are not required, combined with the inability to run extra trains due to the limitations of the current railway signalling system.
With high-speed rail, train travel is always faster than driving. In many cases, it's even faster than flying, once you factor in the whole air travel song-and-dance.
Rail in the US is dominated by freight movements, the passenger sector is very much and afterthought and doesn't receive much investment. As a result their lines are slow, dominated by freight, and their rolling stock is old and low tech. Japan, in contrast, has one of the best and most modern railways in the world.
Amtrak's Acela, which reaches 150 mph (240 km/h) over 49.9 mi (80.3 km) of track and Brightline, which runs at 125 mph (201 km/h) in a dedicated ROW between Orlando and Cocoa, are the US's only high-speed rail services.
In 1970, the Soviet Union began a smooth change of the track gauge from 1,524 mm to 1,5200 mm. This process lasted over 20 years, until the early 1990s. Various official sources indicate that the aim for the change was to increase the stability of the railways when operating freight trains, increasing their speed.
Before the opening of the Qinghai–Tibet Railway in China, currently the highest in the world, the highest three railways were located in the Andean countries of Peru and Bolivia. In the Alps, the Jungfrau Railway has the particularity of reaching an elevation that is higher than the local snow line.