Complex sentence: In North America this is also called an "Equilateral Switch" or "Equilateral Turnout", more often associated with mainline speeds, whereas wye switches are generally low-speed yard switches.
Split into simpler sentences: In North America this is also called an "Equilateral Switch" or "Equilateral Turnout". Common switches are more often associated with mainline speeds, whereas wye switches are generally low-speed yard switches.