How long will a bus last regularly, in the USA/canada?
In the Netherlands, a rule of thumb used to be 10-12 years, but now most bus concessions last 7 years and have the rule that a lot of buses have to be less than 3 years old. So now they all order cheap buses that last only 7 years (but rattle after 2 months and look 12 years old after only a few years...)
But 30 years ... that's amazing...
Tijmen
(our trains are also "young" - a few years back our oldest passenger train was 48 years old - still reasonably young. Our oldest freight locos (an American design,
class 1200) were 56 years old, despite them literally being salvaged from the scrapper. Unfortunately, the last ones were put aside a year ago. Here's an image (in new livery)
Behind them is an ex-Belgian diesel loco. These freight trains ran on electric main lines, and then used their inertia to run on non-electric freight yards. As such, the diesel loco was mostly used for running the electric one around