Marks: Y
18 reporting marks.
- YANYancey RailroadOperating railroad
- YARRYoungstown and Austintown RailroadOperating railroad
- YBYoungstown Belt RailroadOperating railroad
- YCRYakima Central RailwayOperating railroad
- YCRKYellow Creek RailroadOperating railroad
- YDHRYork Durham Heritage RailwayOperating railroad
- YKRYorkrail; York RailwayOperating railroad
- YRCYork RailwayOperating railroad
- YRPLYelm Roy Prairie LineOperating railroad
- YSYoungstown and Southern RailwayOperating railroad
- YSDXYoungstown Steel Door CompanyPrivate owner
- YSMXCanadian Gypsum CompanyPrivate owner
- YSRRYoungstown and Southeastern RailroadOperating railroad
- YSTXYoungstown Sheet and Tube CompanyPrivate owner
- YSVRYellowstone Valley RailroadOperating railroad
- YVYosemite Valley RailwayOperating railroad
- YVTYakima Valley Transportation CompanyOperating railroad
- YWYreka Western RailroadOperating railroad