European experience --- a few buses here in Aberystwyth, tiny town on the edge of Wales, have bike racks. But I have not yet worked out which ones. It seems random, but could be particular routes I suppose. I've never seen them on the buses that go out to the village where I live so I haven't been able to take advantage of it. I'd love a bike friendly bus service for those days when it's nice to cycle in the morning, but then torrential rain when heading home after work.
Also didn't see bike racks on any of the buses around Essex (north of London) when I lived over there. Bikes were allowed on trains (though no racks to put them in) but restricted to folding bikes only within the main commuter belt for London during peak times.
Specialized Tricross Sport / Specialized Lithia 143