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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Railroad switch:

SHUNT: Railroad switch
WYES: Some railroad switch points, e.g.
SHUNTS: Railroad switches
WYE: Three-switch railroad track section
YARDS: Railroad switching area.
TIEBAR: Railroad-switch rod
CROSSOVER: Railroad switching track