If Train DG-CBE via KRR, ED. Some express trains takes a long route via TPJ, KRR , ED.
Two routes for buses
DG to Cbe via Dharapuram Max 4hours
Dg to Cbe via Palani, pollachi 4-5hours.
You...
more... can try Taking train upto Pollachi from DG & change to Bus for Coimbatore from pollachi