Lets start longer ago, Citys have been build along Rivers or next to the oceans. Simply because it was far easier to transport stuff this way.
Then with existent Citys Railroads have been build from city to city.
Then since there was a transport option new citys have been build along the railroads.
That was Europe
In America, well i am no historican, but i think that the Railway from East to west coast was necessary to transport the build material. And after the railway have been build it happened the same as in europe, and new Citys along the railroad made sense.
You already have the core of it in your own question so why don’t you just extrapolate a bit. What is a railroad? It’s transportation infrastructure. What does transportation infrastructure do? It moves resources (as you pointed out) and *people.* What do cities need to grow? Resources and people. Places that were once remote were now readily and easily accessible by rail. When you have people and things passing along that route, that route is going to become a hub, or in other words, a city.
Railtracks do not just transport natural resources, they transport all resources. Before railroads and canals the only way to transport goods was by horse and carrige. This was quite a costly and slow way of transporting things. The railway was the “Amazon Prime” of its day. Cities with rail would grow a lot bigger as factories and other industry would use the railway to deliver goods and order goods from all over the continent. This was just not feasable in cities without railways.
Even today the railway is responsible of carrying a huge part of the worlds mail, including Amazon packages. Huge warehouses have rail spurrs to them allowing them to receive entire trains with packages. But most factories today will have a truck pick up or dropp off the goods, but the truck would often drive to the rail yard to have its trailer loaded onto a train or its container loaded onto the train for long distance transport. The exception to this is the US where, despite it being profitable for the rail companies, individual loads is not prioritized.
It depends on the time an place.
In places like Europe Railways were built to connect cities that had existed for a long time.
In place like the American West frequently cities sprung up alongside railways.
In North America you have to separate out towns and cities that were founded before Railways were a thing, while they were the primary mode of long distance transportation and after they were replaced too a large degree by trucks and cars.
In the days before rail was wide spread, large cities tended to spring on costs and rivers, because humans need water and because boats and ships were a way to transport goods in bulk before the railway was a thing.
In the US in the beginning rivers like the Mississippi and its navigable tributaries (the rivers the flow into it and are big enough to allow boats to move though them) form a natural transportation network and many cities have sprung up around it.
The American West lacked such convenient natural transportation networks. When the railway was built to connect the East coast to the west coast it naturally passed by many existing settlements that grew because goods and people could now easily get there.
Some new settlements sprung up around the railway where none existed before, to take advantage of the railway.
If you have heard of the Donner Party or the Oregon Trail you may have some idea that traveling to the west coast over land was a long and difficult thing, that a person might do once in a life-time.
Before the railway was built to connect the east coast to the west coast, the easiest way to transport people from for example Los Angles to New York was to take a ship down to Panama travel across that country over land and take another ship up to the east coast of the US.
The railway made direct travel from one part of the US to another much easier cheaper, faster and safer.
If you were on the railway you were part of the country and could ship goods out to elsewhere and receive goods from elsewhere.
It wasn’t until the US highways system was built that transporting over the road was a viable alternative.
I live in a rural area. Maybe 1/4 mile behind my house is a grain silo for loading grain onto railroad cars.
In the early days, it would simply have just been a centrally located grain silo stop for the local farmers. Slowly, over time, people would move close to it, probably starting with the people working at the silo and slowly expanding from there. The village i live in has around 1400 residents with a nice housing development, slowly expanding.
It starts with a location people can use to transport goods to sell in a bigger market or to have a way to transport resources from a remote location. If it was, say, a mining operation, the workers would likely live there. They would need support businesses, like a general store, so someone would move there to run that. Then maybe a tavern and a barber shop. As more people move into the area, to support the users of that train stop, you need more and more support services. Then, slowly over time, that area grows into a city.
Railways create a source of communication with the rest of the world at the time of the first railways roads were in poor condition and expensive to move goods along a railway could transport anything not just natural resources, it could be cloth and clothes, or pottery, or pots and pans etc. Along the side of the tracks telegraph wires were laid enabling messages to be sent, people could also travel to establish a new home in the new city making the stuff in the new city.
One reason is that trains have their own infrastructure and support needs.
Steam locomotives: You need water replenishment, fuel replenishment, engine maintenance. This means workers, and workers need housing.
Cargo: most cargo was moved by rail. This means a storage depot for each station, cranes, and of course workers to man all of those.
Postal: yes postal service was train based so each station serves as a postal hub. This requires workers too.
Result: a small town station is already feeding 5-10 families.
On top of this, most trade offices will move next to the train station to have a quicker access and therefore better revenues and more customers.
This will feed some 2-5 families.
Now, it seems little but adding 10-20 families to a town, is huge. Comparatively, that’s 10-20 farms equivalent of wealth and people.
Then there’s industry that will build as close as possible to rail, this will move 10-100 families from the farms to the town.
Factoring in the people that can thrive by selling services to those families, a station can grow a farmer’s town from 500 to 1000 people. And this is in the very short term.
Then the industry will require a school, then the place become a good source of skilled workers, more industry comes and the town snowballs. While the towns without railway access keep losing population as their citizens are carried away by the more interesting opportunities of the railway town.
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