12797 runs packed through out the year and is also a good originating train for CTO to SC. What's the point of extending it to SBC? End-to-end passengers will never prefer it and given it's SL/3AC CC, it won't be very attractive as a daytime ICE with such a short run-time ( hardly 4-5 hours from CTO to SBC). Such trains with an extremely good patronage are best left untouched as extending/diverting them won't add any value.