Kanchipuram - Conjeevaram (CJ) , Sengottai-Shencottah (SCT), Alappuzha-Allepey (ALLP), Thiruvananthapuram-Travancore (TVC), Kollam-Quilon (QLN), Trichur-Thrissur(TCR), Palghat-Palakkad(PGT), Kozhikode-Calicut(CLT), Kannur-Cannanore(CAN),
You ll find more in Kerala
still confused with HX, BSX