Original sentence: All curves in the tunnel are gradual, and on those curves the outside stringer was raised higher than the inner stringer to accommodate trains traveling at speeds of more than forty miles per hour.Each of the two halves of the tube has a minimum width of  and a height of , 6 inches.They are  from center to center, which is six inches (152 mm)  wider than most railway lines
Edited sentence: All curves in the tunnel are gradual, and on those curves the outside stringer was raised higher than the inner stringer to accommodate trains traveling at speeds of more than.Each of the two halves of the tube has a minimum width of  and a height of.They are  from center to center, which is   wider than most railway lines