Has anyone traveled from Islamabad to Karachi from Chaklala station?

I’ve booked Green line tickets from Chaklala Station to Karachi using the Rabta app. Never traveled from there before, and it’s been years since I last took a train.

The app says the train stops for only 2 minutes on the station. I have a lot of luggage, so I’m wondering if that’s enough time to board. Has anyone traveled from Islamabad to Karachi on the Green line? Any advice would be appreciated. Thanks!