This train 12319 should be converted to a daily SF train, or at least be run five days a week. Passengers from Kolkata need a good & regular SF train to Agra via Mathura. Indeed all other trains from Kolkata reach Agra at odd hours... So this is the best train to visit Agra/ Mathura & Vrindaban dham from Kolkata without needing to touch Delhi... So the frequency of this train KOAA-AGC SF Express should be increased...