Gauge Changer
The gauge changer (Spanish: cambiadores de anchos) is a device which forces the gauge adjustment in the wheels. Designs consist of a pair of running rails that gradually vary in width between the two gauges, combined with other rails and levers to unlock, move, support and re-lock the adjustable axles.
In the TALGO-RD system, a constant spray of water is used to lubricate the metal surfaces, to reduce heat and wear. A TALGO-RD gauge changer is 20 metres long and 6 metres wide.
Read more about this topic: Variable Gauge