The Greenford Branch line runs between Greenford to West Ealing or London Paddington Greenford, South Greenford Castle Bar Park, South Drayton, West Ealing Ealing Broadway Acton Mainline & London Paddington the rolling stock used are class 165 Turbo the signalling from Didcot that is Slough
Only the first and last of the day goes to PAD, the rest are shuttles along the 2.5 mile route https://www.realtimetrains.co.uk/search/detailed/GFD/2021-01-02/0000-2359?stp=WVS&show=all&order=wtt https://www.realtimetrains.co.uk/train/P68172/2021-01-02/detailed
Honestly, because of how old the GWML on Steam is (incase you do not know it is 14 years old), you will probably be better off posting this on either JustTrains Forum or suggesting this as part of a New GWML
The OP is no longer with us as they were banned for bumping their own posts which upset some forum members.
I am personally gutted that he is no longer with us as I personally enjoyed his repetitive copy and pasted phrases. Regarding this I do think an updated GWML for Steam is long overdue. Paddington to Reading with full Henley, Bourne End, Greenford and Heathrow Branches and if possible, extensions to Oxford, Swindon and the Old Oak Common to Greenford extension.