u/Straight-Total-9202

Hi all, not Thomas specific, but my son has probably 50 trains, a lot from Whittle Shortline and likes to run 10-15 car trains. We build the track through our downstairs, about 50.ft in total. I understand the length of the train and curves all come into play, but does anyone have any creative ways to help the trains not fall inward around curves? We try to keep the curves minimal and won't even put 2 together so it's not too tight of a turn. They are standard size, normal degree curves. Would any extra weight on them help or anything else?