MM-T-371E, FEDERAL SPECIFICATION: TIES, RAILROAD, WOOD, (CROSS AND SWITCH) (31 JUL 1975) [SUGGESTED REPLACEMENT AMERICAN RAILWAY ENGINEERING ASSOCIATION MANUAL, CHAPTER 3]
MM-T-371E, FEDERAL SPECIFICATION: TIES, RAILROAD, WOOD, (CROSS AND SWITCH) (31 JUL 1975) [SUGGESTED REPLACEMENT AMERICAN RAILWAY ENGINEERING ASSOCIATION MANUAL, CHAPTER 3]., This specification covers standard and narrow-gage railroad cross ties and switch ties.