The National Academies Press

Currently Skimming:

Pages 41-45

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.

From page 41... ... 41 APPENDIX E APTA/FRA Track Safety Standards and Some Maintenance Standards The following charts are based on reported maintenance standards. Each transit agency has its own maintenance standards and many use either APTA or the FRA for their safety standards. Read the entire page →
From page 42... ... 42 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 3 3 1 3 1½ 2 3 2½ 2 3 1⅞ 2 30 2 2 ¾ ¾ 1¾ 2 2 3 60 1¾ 1¾ ½ 1¼ 1¾ 1¾ 4 80 1¼ 1¼ 1 1¼ 5 90 1 1 ¾ 1 1 15 2 1¼ 2 (1¾) Read the entire page →
From page 43... ... 43 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 2 4 2 30 3 3 60 3 3 3 3 4 80 5 90 1 15 2 4 3 3 2 30 3 2 3 60 2 3 2 2 2 4 80 5 90 1 15 2 30 3 60 4 80 5 90 1 15 2 30 3 60 4 80 5 90 1 15 2 30 3 60 4 80 5 90 2 1 1 2 2 1 within 18" 2 2 2 2 No Criteria No Criteria 1 1 1 22 Number of ties within 24" of the center of a joint 1 1 1 within 12" 1 within 24" N/A Replace Rail Replace Rail Replace Rail Replace Rail Replace Rail Replace Rail Replace Rail Not Permitted N/A N/A N/A N/A Install Install 21 Torch cut holes or torch cut rail N/A N/A No Criteria Not Permitted Not Permitted Install Install Install Install Install Install20 In CWR at least 2 bolts per rail Install Install Install Install Install Install Install Install Replace 19 Less than 2 bolts per rail, Classes 2-5 and 1 bolt per rail for Class 1 Install Install Install Install Install Install No Criteria Replace Replace Replace Replace Replace Replace 18 Center cracked joint bars Replace Replace Replace Immediate Replace Immediate Replace Immediate N/A N/A N/A N/A Replace Replace Replace Replace Replace 1 17 Quarter Cracked joint bars with bolts loose N/A N/A Replace in 30 days Replace Replace No Criteria N/A 2 1 1 2 1 1 2 3 3 No Criteria 1 2 1 2 2 2 2 16 Maximum defective ties or fasteners in a row for R < 1000'. Read the entire page →
From page 44... ... 44 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 2 30 3 60 4 80 5 90 1 15 ¼ ¼ ³/₁₆ ⅜ ⅜ 2 30 3 60 ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ 4 80 5 90 1 15 ¼ ¼ ¼ ¼ ¼ ¼ ¼ ¼ 2 30 3 60 4 80 5 90 1 15 ½ ½ ³/₁₆ ½ ½ ⅜ ½ ½ ⅜ 2 30 ¼ ¼ ¼ ¼ ¼ 3 60 ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ 4 80 ⅛ ⅛ ⅛ ⅛ ⅛ 5 90 ¹/₁₆ ¹/₁₆ ¹/₁₆ ¹/₁₆ ¹/₁₆ 1 15 1½ 3 (-⅜) Read the entire page →
From page 45... ... 45 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 1⅜ 1⅜ 1⅜ 1⅜ 1⅜ 1⅜ 2 30 3 60 4 80 5 90 1 15 ⅝ 2 30 ½ 3 60 ⅜ 4 80 5 90 1 15 -½ -½ -½ -⅞ -⅜ -½ -½ -½ 2 30 -⅜ -⅜ -⅜ -¼ -⅜ 3 60 -¼ 4 80 -¼ 5 90 -⅛ -⅛ -⅛ -⅛ 1 15 ½ ½ ½ ½ ½ ½ ½ 2 30 ⅜ 3 60 4 80 5 90 ¼ ¼ ¼ ¼ 1 15 2 30 3 60 4 80 5 90 Once per Year Once per Year 3 times per year Every 2 years Twice per year Twice per year 4 times per year Once per Year 36 Frequency of Geometry Car Testing on Mainline Once per year No Criteria 3 times per Year No No No<2MGT,<30mph Pass. 24 months No No No No No No Weekly Twice Weekly Weekly Twice Weekly 35 Frequency of Gage Restraint (GRMS) Read the entire page →

From page 41...

... 41 APPENDIX E APTA/FRA Track Safety Standards and Some Maintenance Standards The following charts are based on reported maintenance standards. Each transit agency has its own maintenance standards and many use either APTA or the FRA for their safety standards.

Read the entire page →

From page 42...

... 42 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 3 3 1 3 1½ 2 3 2½ 2 3 1⅞ 2 30 2 2 ¾ ¾ 1¾ 2 2 3 60 1¾ 1¾ ½ 1¼ 1¾ 1¾ 4 80 1¼ 1¼ 1 1¼ 5 90 1 1 ¾ 1 1 15 2 1¼ 2 (1¾)

Read the entire page →

From page 43...

... 43 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 2 4 2 30 3 3 60 3 3 3 3 4 80 5 90 1 15 2 4 3 3 2 30 3 2 3 60 2 3 2 2 2 4 80 5 90 1 15 2 30 3 60 4 80 5 90 1 15 2 30 3 60 4 80 5 90 1 15 2 30 3 60 4 80 5 90 2 1 1 2 2 1 within 18" 2 2 2 2 No Criteria No Criteria 1 1 1 22 Number of ties within 24" of the center of a joint 1 1 1 within 12" 1 within 24" N/A Replace Rail Replace Rail Replace Rail Replace Rail Replace Rail Replace Rail Replace Rail Not Permitted N/A N/A N/A N/A Install Install 21 Torch cut holes or torch cut rail N/A N/A No Criteria Not Permitted Not Permitted Install Install Install Install Install Install20 In CWR at least 2 bolts per rail Install Install Install Install Install Install Install Install Replace 19 Less than 2 bolts per rail, Classes 2-5 and 1 bolt per rail for Class 1 Install Install Install Install Install Install No Criteria Replace Replace Replace Replace Replace Replace 18 Center cracked joint bars Replace Replace Replace Immediate Replace Immediate Replace Immediate N/A N/A N/A N/A Replace Replace Replace Replace Replace 1 17 Quarter Cracked joint bars with bolts loose N/A N/A Replace in 30 days Replace Replace No Criteria N/A 2 1 1 2 1 1 2 3 3 No Criteria 1 2 1 2 2 2 2 16 Maximum defective ties or fasteners in a row for R < 1000'.

Read the entire page →

From page 44...

... 44 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 2 30 3 60 4 80 5 90 1 15 ¼ ¼ ³/₁₆ ⅜ ⅜ 2 30 3 60 ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ 4 80 5 90 1 15 ¼ ¼ ¼ ¼ ¼ ¼ ¼ ¼ 2 30 3 60 4 80 5 90 1 15 ½ ½ ³/₁₆ ½ ½ ⅜ ½ ½ ⅜ 2 30 ¼ ¼ ¼ ¼ ¼ 3 60 ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ ³/₁₆ 4 80 ⅛ ⅛ ⅛ ⅛ ⅛ 5 90 ¹/₁₆ ¹/₁₆ ¹/₁₆ ¹/₁₆ ¹/₁₆ 1 15 1½ 3 (-⅜)

Read the entire page →

From page 45...

... 45 Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In Min In Max In 1 15 1⅜ 1⅜ 1⅜ 1⅜ 1⅜ 1⅜ 2 30 3 60 4 80 5 90 1 15 ⅝ 2 30 ½ 3 60 ⅜ 4 80 5 90 1 15 -½ -½ -½ -⅞ -⅜ -½ -½ -½ 2 30 -⅜ -⅜ -⅜ -¼ -⅜ 3 60 -¼ 4 80 -¼ 5 90 -⅛ -⅛ -⅛ -⅛ 1 15 ½ ½ ½ ½ ½ ½ ½ 2 30 ⅜ 3 60 4 80 5 90 ¼ ¼ ¼ ¼ 1 15 2 30 3 60 4 80 5 90 Once per Year Once per Year 3 times per year Every 2 years Twice per year Twice per year 4 times per year Once per Year 36 Frequency of Geometry Car Testing on Mainline Once per year No Criteria 3 times per Year No No No<2MGT,<30mph Pass. 24 months No No No No No No Weekly Twice Weekly Weekly Twice Weekly 35 Frequency of Gage Restraint (GRMS)

Read the entire page →

Key Terms

← Previous Chapter Skim

Next Chapter Skim →

This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More information on Chapter Skim is available.