(Fictional). In an alternate 2021, where the Maerdy branch still carries a regular passenger service, take an upward bound class 153 with passengers who have just connected off the mainline, from Porth to Ferndale.
Difficulty: Easy
Requirements:
JT class 153
AP class 158 EP (Perkins)
MJW 153 revamp pack
MJW 153 TfW reskin
MJW 158 TfW reskin
You can find them here:
https://www.justtrains.net/product/class-153-dmu-advanced
https://www.armstrongpowerhouse.com/enhancements/multiple_unit/class_158_perkins_enhancement_pack