Few Premium Route Numbers

Triple Series
111	Coimbatore	Internal
222	Namakkal	Internal
333	Tiruvarur	Internal
444	Cuddalore	Kancheepuram
555	Kanniyakumari	Tirupathi
666	Pudukottai	The Nilgiris
777	The Nilgiris	Kerala
888	Trichy	Cuddalore
999	Karaikal	Bengaluru
Centuro
100	Ariyalur	Internal
200	Madurai	Internal
300	Tirunelveli	Internal
400	Ariyalur	Chennai
500	Erode	Chennai
600	Madurai	Chennai
700	Salem	Chennai
800	Tirunelveli	Chennai
900	Tuticorin	Chennai
c0m Successive
123	Cuddalore	Internal
234	Pudukottai	Internal
345	Trichy	Internal
456	Cuddalore	Bengaluru
567	Karur	Salem
678	Pudukottai	Pudhucherry
789	Theni	Villupuram
890	Trichy	Dindigul
901	Tuticorin	Vellore
c0m Successive Reverse
109	Ariyalur
210	Nagapattinam
321	Tiruvannamalai
432	Covai	Pudukottai
543	Kanniyakumari	Madurai
654	Namakkal	Vellore
765	Nilgiris	Trichy
876	Tiruvarur	Bengaluru
987	Andhrapradesh	Kerala North