483 started as it was the only operational engine in 1970
484 started the 1971 season alone, and 483 was later operational that same year.
487 came along around 1973-74 I believe
483 last ran in 1977.
489 first operated in 1981, cause I was there that year
488 I don't really know when this engine first ran. I assume it was restored before 483 was retired, or shortly thereafter.
1991-92 497 swapped from D&S, 482 to D&S. 497 ran C&TS in 1992
Not 100% positive on some of these dates, but close. I thought I had a list of stuff Earl mentioned regarding this but I could not readily find it.
Greg