From lines to networks
The first railways were individual lines, each with its own company, its own rules and often its own idea of how far apart the rails should be. A railway system, in the sense of a connected national network, needed more than tracks. It required that a wagon built in one place could travel on another company’s line, that timetables made sense across towns, and that the people running trains agreed on how to keep them apart. Most of that was settled over decades, sometimes by the companies, sometimes by governments, and sometimes by painful experience.
Gauge: how far apart are the rails?
Many early British colliery lines used a track width of about four feet eight inches, set by local practice, and George Stephenson used a similar width, with an extra half inch, on his railways. That gave the width of 4 feet 8½ inches (1,435 millimeters) that is now called standard gauge. Isambard Kingdom Brunel, engineer of the Great Western Railway, chose a wider gauge of 7 feet and a quarter inch (about 2,140 millimeters) for greater stability and speed. This led to what is often called the gauge war in Britain. At places where the two met, passengers and goods had to change trains, which was slow and expensive.
A Royal Commission looked at the problem, and the Gauge Act of 1846 required new passenger lines to be built to standard gauge. The Great Western continued to run broad gauge on its existing lines until 1892, when it was finally converted. Other countries made different choices: Ireland standardized on a wider gauge, Russia on another, and Spain and Portugal on a broader gauge than most of Europe, which still affects through running today. In the United States, several gauges were common until the 1880s, when the Southern railroads converted to standard gauge in a coordinated effort, reportedly over a few days in 1886.
Timetables and railway time
Before railways, towns kept local solar time, so noon in Bristol came a few minutes after noon in London. That did not matter much when travel was slow. For a timetable it was awkward. British railways began to use London time on their lines, and the Great Western adopted it across its network in 1840. Most British railways followed, and in 1847 the Railway Clearing House recommended that all companies use Greenwich Mean Time, in practice making it the national standard, although it was not fixed in law until 1880.
In North America, the problem was even larger because the continent spans many degrees of longitude. Railroads ran on dozens of local times. On November 18, 1883, American and Canadian railroads adopted standard time zones, a system that towns and states gradually followed. In 1884, an international conference in Washington selected Greenwich as the prime meridian, supporting a world pattern of time zones. Railroad needs were a major reason standard time came about.
Signaling and rules
For a network, operating rules had to work across lines. The block system and interlocking helped manage busier lines, and the electric telegraph made it possible to tell stations ahead of a train’s progress. Common signal conventions, rule books and a shared sense of how trains met and passed on single track reduced confusion when trains from different companies ran over each other’s tracks, which happened often through “running powers” agreements.
Clearing houses, joining and grouping
Railways also needed a way to share revenue. If a passenger bought a ticket for a journey over three companies’ lines, someone had to divide the money. The Railway Clearing House, set up in London in 1842, handled this and later also managed the sharing of wagons. Standard wagon couplings and brake systems made through freight easier. In the United States, interchange rules for freight cars developed in a similar way, and the Master Car Builders’ Association worked to standardize couplers and brakes.
Over time, companies merged or were grouped by governments. In Britain, more than a hundred companies were combined into four large groups in 1923, and then nationalized in 1948. Other countries created state railway systems from the start or took them over later, such as Japan’s government railways, which were organized in the early twentieth century and reorganized into regional companies in 1987. The details differ, but the direction was toward fewer operators and more consistent rules.
Networks and what came after
A connected network lets goods and people reach far places without much transfer, and it gave rise to railroad towns, wholesale markets and commuter suburbs. In the twentieth century, competition from roads and aviation reduced the role of rail in many countries, and branch lines closed. At the same time, trunk routes were electrified and, from the 1960s, high-speed lines were added to the network, which made the fastest services a new layer on top of the existing one. The core lesson of the story is that a railway system is as much an agreement as a piece of engineering. Gauge, time, signals and accounts all needed shared standards before the network worked as one.