Erm, it probably would since those trains are bloody heavy...Think of it this way, you throw something with a bit of force and it lands at a certain point, if you were to throw it again with more force it would land further away...Adding an extra row is NOT a small allowance for a coaster though... All the original calculations would have to be changed in order to fit the new weight/force/etc values that would be needed and therefore results would change and so on...