It will provide significant extra public transport capacity to keep communities in Devon and Cornwall connected while one of the main railway lines is closed following the collapse of the sea wall and damage to the track at Dawlish.
The new services will use a rail hub at Honiton providing onward coach connections to a number of destinations in the south-west.
From Honiton there will be four routes: Cullompton-Tiverton-Barnstaple; Newton Abbot- Torquay-Paignton-Totnes-Plymouth; Launceston-Bodmin-St.Austell-Truro-Penzance: and Okehampton - Bude.
The coach-rail services will operate Mondays to Fridays. On Saturdays and Sundays, there will be one departure in each direction on the Plymouth and Barnstaple routes only.
A fleet of five double-decker coaches will be used for the operation, offering 4,000 seats a week. Prices will start from £1 (plus 50p booking fee) and most passengers will pay less than £28, with the network offering journeys of up to around 300 miles.