The Tacoma Narrows bridge "Galloping Gertie" 
http://www.ketchum.org/bridgecollapse.html is probably the most famous, 
the traffic loading or strong winds had nothing to do with it. Just a 
moderate wind in right direction, the right shape, and harmonics. This 
was 1940

1964 Univ. of Mich. as part of a senior level structural engineering 
class I reported on the Quebec bridge, started  3 times before it 
lasted, and still in use today. The 2nd collapse - the cantilever end 
amplitude was 6 feet after the center span load came loose. Bridge 
opened 1917.
http://www.google.com/search?q=quebec+bridge&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
(address might get wrapped, should be one line)

Alan B. Pearce wrote:
>>> Picture of the railway bridge I am thinking of here
>>> http://trains.wellington.net.nz/misc2/south_rangitikei_1985.jpg
>>>       
>> Is that the one that fell down fatally during construction
>> the first time ?
>>
>> Maybe that was Mangaweka.
>>     
>
> Hmm, don't remember that.
>
>   
>> AFAIR from long ago, the one mentioned has a maximum design
>> side sway of 5 metres at the top during a quake. Now THAT
>> would be an interesting train ride.
>>     
>
> I don't think one would not be worrying about how interesting it would be - 
> one would probably require a change of trousers ... Guess that makes it 10 
> metres wide at the top, so 5 metres would still (just) allow the CoG to 
> still be between the feet.
>
> The other bridge I remember is the Symonds St vehicle bridge in Auckland, 
> over the south motorway. It is flexibly mounted in such a manner that it 
> resonates with a bus engine at idle. With a set of traffic lights at both 
> ends, it can be un-nerving to be sitting at a red light and have a bus pull 
> up beside you in the bus lane, and suddenly have the car bouncing vertically 
> with the combined movement of the bridge and car suspension giving the car 
> body an oscillation that feels like about 3" of vertical movement.
>
>
>
>   
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