and are also expected to reduce journey times from London to Exeter by up to five minutes , to Plymouth by up to six minutes , and to Penzance by up to 14 minutes .
The trains are expected to enter service with GWR from 2018 .
Are also expected to reduce journey times from London to Exeter by up to five minutes , to Plymouth by up to six minutes , and to Penzance by up to 14 minutes .
The trains are expected to enter service with GWR from 2018 .