Basic funda is to run trains with maximum permissible coaches to serve maximum number of people and ensure good revenue collection at the same time.
It is better to concentrate on ACSF trains which have maximum probability of 100% occupancy.
Operate GR train/Tejas/Humsafar if there is traffic for 24ICF/22LHB coach train with 130kmph speed and high priority. There is no point in running premium (fully ac) trains with less number of coaches.
There...
more... may be about 10-15 routes for GR, about 10 routes for Humsafar, or about 5 routes for Tejas which can fulfil this criteria, where such trains should be operated.