crs1026
Superstar
A reasonable guess, the vehicle ages slower when it is not in active use, but it still ages somewhat. The rate of aging should be in the range of 35% - 50% of the active-use rate of aging.
In case of ECLRT vehicles, the aging is not critical at this point, but is not negligible and needs to be accounted for in the long-term fleet replacement plans.
There will be components whose aging is time-based - meaning these deteriorate and need maintenance whether the tram is used or not - and other components whose aging is use-based - meaning they will be fine until the heavy wear and tear of daily service sets in.
Five years is long enough to need a renewal program to start replacing some of those time-based components. Plus, the testing in aggregate probably now represents a year of use, so there is some wear and tear already accumulated. If the contractor has been laying off this maintenance, figuring it isn't accumulating prior to handover.... I imagine there are reliability issues already showing up. TTC may not be perfect, but I bet they know tons about how fast Flexities age and which components need fixing soonest.
And in the end, rust never sleeps. Trams that have been sitting in the yard may not have mechanical wear and tear, and will have minimal exposure to salt... but penetration of ground moisture will have been happening even without the cars going anywhere.
- Paul




