The original section of the school was replaced in 2001.

The section was withdrawn and replaced by new route 333 in 2003.

Instead the damaged section can be cut loose and replaced with a new piece.

It reopened late June 2008 after a section of track was replaced.

A section of the wall, some 46 yards, long was lost and replaced with a wall.

Prior to the 2012 operating season, many sections of track after the first drop were replaced.

Its movable middle section of wood was replaced by a metal one in 1912.

That elevated section later was abandoned and replaced by Interstate 690.

This section was replaced with a historically-faithful copy in 1970.

At one end a narrow section of the wall had been cut away and replaced by a tall grille.