8546 stuck around until April 2007. You're correct about 8553!
8553 got a rebuild in early 2002, while 8546 got a full rebuild around late 2003 if I recall correctly! It wouldn't have made sense for it to retire in 2005 unless it got into a major enough accident. 🙂
I actually quite enjoy the Enviro 500, especially when the top front seats are available. As quiet as it gets, and you have nice views of the city!
Other than that, I haven't been in Ottawa long enough to try anything holder than the hybrids so I am gonna abstain of commenting on older ones.
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