the west of england line starts from Exeter st davids runs 124 miles through the county of somerset Wiltshire Dorset and Hampshire to Basingstoke with class 159 express sprinters
DTG are not going to build what is already available from other makers You can have all the way from London Paddington to Penzance in One Route https://www.justtrains.net/product/western-mainlines-the-complete-collection Peter
I think that the OP means the Exeter, Yeovil, Salisbury, Andover, Basingstoke line Not sure if that IS in game
My error - the OP has been posting so much cr@p recently it is difficult to wade thru He does want a line from Exeter to Readding via Westbury [that is the way he spells it]