Due to engineering works the line Between Tiverton parkway and Taunton have been closed
so all trains to London Paddington have been diverted onto the West of England mainline.
Drive the last leg of a GWR service from Paddington to Plymouth operated by an HST from Honiton to Plymouth via Exeter St Davids.

This scenario is based on the old may 2019 timetable but as I could not find any revised timetables that covered the engineering works I have had to make some assumptions using the information from GWR and network rail press releases about the train services that would run during the engineering work. Therefore the following scenario is not 100% accurate but I did aim to create AI traffic that is as close to the real thing as possible with the info I had.

Requirements:
The Railways of Devon and Cornwall V8 – https://alanthomsonsim.com/?download=the-railways-of-devon-and-cornwall

From steam
DTG Riviera Line
DTG East Coast Main Line London-Peterborough (for the class 800)
DTG Class 150/1
DTG NSE Class 159

From Armstrong Powerhouse
Class 43 (MTU) Enhancement Pack
Class 158 (Cummins) Enhancement Pack
Class 150/1 Enhancement Pack
Class 150/2 DMU pack

From Justtrains
Class 220/221
Class 153 Advanced

From Superalbs
Class 153 – Great Western Railway https://superalbs.weebly.com/class153greatwesternrailway.html
Class 143 – Great Western Railway https://superalbs.weebly.com/class143greatwesternrailway.html
class 800 – Great Western Railway https://superalbs.weebly.com/class800greatwesternrailway.html

From Caledonian railworks
Class 153 – 153333 (Visit South Devon) – https://caledonianrailworks.wordpress.com/reskins-by-class-type/class-153/
Class 153 – 153325 CitizensRail – https://caledonianrailworks.wordpress.com/reskins-by-class-type/class-153/