It was claimed to have been the first purpose built speedway track in Britain.
A speedway track was built in 1952, which was used for training purposes.
The circuit was moved on to the outside of the speedway track and facilities were improved.
The opening meeting was scheduled for 17 July 1961, but due to heavy flooding, construction of the speedway track had been delayed.
Later, with the grass gone, it was claimed to be the first purpose built speedway track in Britain.
They run over a series of rounds at different speedway tracks.
Stock car racing took place at many greyhound and speedway tracks.
Outdoor facilities include football fields and a speedway track with grandstand.
Bulgaria has one domestic league, with a total of six speedway tracks.
A 450m long speedway track surrounded the playing field of the Stadium prior to the 2011-12 redevelopment, when it was removed.