You need to know the history of this train. It is actually a combination of two trains - the earlier 2637 Koodal Express MG and 67** Madurai - Guruvayur Express ONT. These were combined to run as one train, similar to how 6607 MS-ED/CBE Express and TPJ-MAQ Express are combined as one MS-MAQ Express.
Nobody will ofcourse book this train to GUV from MS!