In the US, multiple stations in the same city were built by competing railroads. In some cases competing roads were able to agree on a Union Station. Examples include large cities such as Portland, Tacoma, Los Angeles, and small cities such as Moscow, Idaho. In foreign nations separate stations are often due to the dificulty of entering large built-up cities where reaching the city center requires too much costly demolitional. Some cities ended up with a north station, south Station etc. With taxi or subway transfer between each. Examples include Paris, and London.