It was officially known as "Edinburgh Racecourse", and referred to as such in the English press, until the beginning of 1996 but was widely referred to as "Musselburgh" in Scotland long before that and was widely referred to as Musselburgh in the racing pages of Scottish newspapers.
The Edinburgh Racecourse was formally recognized by official channels until 1996, while being widely referred to as Musselburgh in Scotland prior to that.