This service is Operated by Great Western Railway on the Route between London Paddington and Reading on a non stop run six nights a week between Sunday and Friday. The trains full route is London Paddington to Penzance but the first part of the trains route to Reading is possible on the current route for Train Sim World. Having this added to the GWE route will give some variety in traction on the route and new challenge as the train set would have to shunted from Old Oak Common to the Platform in London Paddington. The Service is Operated by Class 57 locomotives: 57602 Restormel Castle 57603 Tintagel Castle 57604 Pendennis Castle 57605 Totnes Castle These 4 locomotives work in pairs on two identical sets of coaches one working from Paddington to Penzance and the other working Penzance to Paddington. The normal train length is 7 to 8 MK3 coaches depending on the time of the week. I think that this is something that would be welcomed on the GWE route in Train Sim World and its a service that does operate on the route so is authentic operation which would add variety to the route with new added traction.
Don’t forget it’s top n tailed between London and Reading so that could be another part of a scenario