Each program adopted by a railroad shall comply not later than the date specified in the following schedule:
(a)
For each Class I railroad (including National Railroad Passenger Corporation) and each railroad providing commuter service in a metropolitan or suburban area, March 15, 1997.
(b)
For each Class II railroad, April 15, 1997.
(c)
For each Class III railroad, switching and terminal railroad, and any railroad not otherwise classified, May 15, 1997.
(d)
For each railroad commencing operations after the pertinent date specified in this section, the date on which operations commence.