I doubt that there'll be any retiring of old coaches, but expect that 1-3 of the older coaches are now in the shops for restoration. With the passenger load, it'll be easier to temporarily "lose" these coaches due to the arrival of six new ones this year and four last year.
I have photos of the new trucks for last year's coaches, the four new Hamilton coaches delivered last year and one of the new 2001 coaches at my web site as well as a photo from 2000 of a wooden coach being restored. Check out:
[wpyr.netfirms.com]