A Question posted to SWR regarding increase of frequency from SBC/YPR to KCVL/NCJ and SBC-CBE was answered like this.
SORRY FOR POSTING SOMEBODY'S QUESTIONS AND ANSWERS.
Remarks for the points pertaining to South Western Railway: The rake of Train No 16537/16538 Bangalore-Nagercoil weekly express is integrated with other express trains. It is not feasible to increase the frequency of this train for the present due to resource, path, and platform and pitline constraints at Bangalore city station. The average occupancy of Train No 12257 Yesvantpur-Kochuveli Tri-weekly Express and Train No 12258 Kochuveli-Yesvantpur Tri-weekly...
more... Garibrath express is 87.5% and 85.05% respectively. Hence, it is not feasible to increase the frequency of this train for the present. The services of Train No 12677/12678 Bangalore-Ernakulam-Bangalore Intercity Express are available during day time from Bangalore to Coimbatore. Hence, it is not feasible to introduce additional train from Bangalore to Coimbatore.