Where were the first railroads built 1800?

The first railroads were built in the early 1800s in Britain, with the Stockton and Darlington Railway opening in 1825 as the first public railway to use steam locomotives. Prior to this, horse-drawn railways had been used in mining areas, such as the ones in Wales and the coalfields of northeast England. The development of these early railroads laid the foundation for the expansion of railway networks worldwide.