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Well, in order to have Talgos moving at higher speeds (let us say 90/100 mph. Cascades can tehoretically reach 125, since tey're Talgo 200 derivatitives), it will be necessacry to install an ATS/Cab signal system, wich mandatory in order to comply with FRA and other standards. <br />For higher speeds, other measures will have to be applied, such as closing all grade crossings and a better signaling system. <br />In terms of track speeds, being Talgos passive tilting trains, they can steer in curves (Ok conventional tains steer marginally 1 or 2 degrees due to the movement of its suspensions) to a maximum of 8 degrees, with 5 being the standard. This, and the fact of veihcles being shorter than a regular 85' car allows such trains to have a better acceleration in curve. With such caractheristics, theoretically a Talgo train is able to reach higher speeds (20% more than a conventional train). <br />As a final note, newer trains entering service in the Madrid-Lerida (and in the future, Barcelona) high speed line, are presently being certified for 137 mph, and there is a prototype being readied for 230 mph, in order to cover the 400 miles of the new line in 2 1/2 hours
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