Talgo I on a demonstration tour in Guadalajara, watched by the
curious public. The train had a very nice observation car at the
end - an idea that was carried on in the Talgo II, though with
a different design. I don't know what the purpose of the end door
between the characteristic wheel casings was - as the train had 
no coupler, there was no way to get from it to another train 
... You can see that the second car from the end had bigger 
windows than the rest of the train as well.
<p>
Photo &copy; Patentes Talgo, used with permission.