Railroads allowed for faster movement of goods, across a wider distance, than had been possible before. Simple as that. Especially with regards to the US transcontinental rail system, it changed a 6 to 9 month sea voyage from New York to San Francisco to a week-long rail journey.
The main work of the PWD department is to develop and maintain the roads, bridges, rail and infrastructure of the state.
it helped it by helping the railroads staying together
through the under ground rail roads
rail roads
Canada
Alaska
cotton from the south
Rail roads
Westinghouse
for military propose or to get mountains out of the way to make roads or rail roads
Rails, usually made out of steel.
In Rome or Bari probably.