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The technical capability of the Talgo carriages is not used with the Cascades service. The FRA allows 6 inches of unbalanced superelevation in its waiver. BNSF, the track owner, allows only 5 inches.

© Steven J. Brown, used with permission. This picture is originally located at his own homepage. It can be found here in its original context.

Unit conversion for text on this page.
6 inches unbalanced superelevation 152 mm unbalanced superelevation 1.0 m/s2 unbalanced lateral acceleration
5 inches unbalanced superelevation 127 mm unbalanced superelevation 0.83 m/s2 unbalanced lateral acceleration