This is the Click-Clack Table Tennis Table, a unique luxury ping pong table for specific tastes. It's regulation size, including the net. But the net and the table supports are railroad tracks. Holding them up are huge slabs of oak and hickory that used to be railroad ties.
It's made by Railyard Studios, a company that salvages wood and steel from railroads to make bespoke furniture. This particular table was recovered from the Tennessee Coal & Iron Company. The markings on the steel and wood indicate that they were made in 1904 and 1921, respectively.
-via My Modern Met