Haramain Train extra luggage?

Salam, everyone! Inshallah we will be doing Umrah in 2 weeks. I was wondering if anyone had any experience with the train from Madinah to Mecca and the SPL service. I’ve heard people here say that they’re strict and some say that it could be a hit or miss. Worst case scenario you pay for the SPL service, but how does that actually work? We have three large checked bags and two carry-on bags, along with two personal backpacks. My main concern is how soon the bags will reach the Mecca train station? We have a flight from Jeddah that leaves four days after we arrive in Mecca. Any advice or input would be much appreciated.