is oct 4 thurs or 5 fri., 18 less crowded on train from beijing to shanhaiguan & return?

i visited almost everything in beijing already but i will be staying in beijing again oct 2-11/18. i plan to stay 1 night guibei water town & simatai great wall during week of 8 oct/18, then relax in beijing before head home oct 11/18. trying to see if same day visit to shanhaiguan will be less busy on above date?
thank you.