This route is by Dovetail Games. You can find it here: https://store.steampowered.com/app/1055333/Train_Simulator_South_Western_Main_Line_Southampton__Bournemouth_Route_AddOn/
Written by Taylor Haggarty. (Based on a real timetable). This scenario sees you drive 158 880 on 1J41 to Lymington Pier then 1J42 on the return. It’s a nice 25 minute drive and it’s a nice sunny February afternoon in this drive, backdated to the SWT era.
Difficulty: Easy
Requirements:
DTG's Southwestern Mainline
DTG's Portsmouth Direct line
RSC NSE 159
AP 158 (Cummins) EP
AP 444/450 EP
You can get them here:
https://www.armstrongpowerhouse.com/class_444-450_enhancement_pack?search=444