The Buffalo and South Western Railroad was short-lived and was leased by the New York, Lake Erie and Western Railroad on August 1, 1880, for an annual rental of 35 percent of the gross earnings for the line.

On November 19, 1895, the Erie officially merged the Buffalo and South Western by virtue of owning 100 percent of the B&SW stock.

Much of the line operated by the Buffalo and South Western Railroad still sees use.

The Buffalo Southern Railroad operates the portion from Buffalo to the Erie County line at Gowanda and the New York and Lake Erie Railroad operates the line south from Gowanda to South Dayton, including an excursion train that runs in the summer.

Additionally, since 2016,[1] under the auspices of the Buffalo, Cattaraugus & Jamestown Scenic Railway, a not for profit organization, Buffalo Southern hosted and provided motive power for seasonal excursions from Hamburg to Water Valley New York.