>
>That's not quite correct, Chris (although it's an understandable
>misinterpretation).
>
>Here's a high-def image:
>http://upload.wikimedia.org/wikipedia/commons/f/ff/RENFE_Class_730_Viaducto_
>Martin_Gil.jpg
>
>The rolling stock is indeed articulated, but the wheelset between each coach
>is not on an axle!
>
>A couple of videos from the manufacturer. This is without any commentary:
>http://www.youtube.com/watch?feature=player_embedded&v=SqX_13cPk0M
>
>This has an explanation of the wheelset concept at 2:44 onwards:
>http://www.youtube.com/watch?feature=player_embedded&v=OF7krSxJ71A
>
That's very interesting. The articulated trainsets are "tilt trains" with
the wheels on separate interdependent vertical pistons. That's an interesting
innovation in tilt train design. Another one is the Australian narrow-gauge
tilt trains that use a two-piece curved bolster where the two pieces slide
together with hydraulic pistons. If the hydraulic pressure fails the wheelsets
will self-centre.
Chris
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