2Light Rail Transit Facilities                     Design Course                   Light Rail Alignment                   ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   3Light Rail Transit Ali...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   4Light Rail Transit Ali...
Light Rail Transit Facilities                  Design Course   Light Rail Transit Alignment Design   5General Vehicle Char...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   6Accessibility
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   7Comparison of Light Ra...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   8Light Rail Transit Ali...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   9Vehicle Loads      •AW...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   10
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   11Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   12Wheel/Track Relations...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   13
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   14
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   15
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   16Light Rail Transit Al...
Light Rail Transit Facilities                     Design Course   Light Rail Transit Alignment Design   17    Vehicle Perf...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   18Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   19Dynamic Envelope     ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   20
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   21Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   22Guideway Clearances  ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   23CE = VDE + OWF + RC  ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   24Guideway Clearances  ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   25
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   26
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   27CE = VDE + OWF + RC  ...
Light Rail Transit Facilities                   Design Course   Light Rail Transit Alignment Design   28Track at Station P...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   29
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   30Light Rail Transit Al...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   31Typical Ballasted Se...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   32Open Track      Balla...
Light Rail Transit Facilities                  Design Course   Light Rail Transit Alignment Design   33Typical LRT Median
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   34Open Track      Balla...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   35Open Track      Direc...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   36Open Track      Direc...
Light Rail Transit Facilities                   Design Course   Light Rail Transit Alignment Design   37Open Track  Direct...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   38Light Rail Transit Al...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   39In-Street Alignments...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   40In-Street Alignments...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   41In-Street Alignments...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   42Light Rail Transit Al...
Light Rail Transit Facilities                  Design Course   Light Rail Transit Alignment Design   43Adjacent to Freight...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   44Adjacent to Freight ...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   45Adjacent to Freight ...
Light Rail Transit Facilities                 Design Course   Light Rail Transit Alignment Design   46Adjacent to Freight ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   47Light Rail Transit Al...
Light Rail Transit Facilities                    Design Course   Light Rail Transit Alignment Design   48Elevated (Bridges)
Light Rail Transit Facilities                     Design Course   Light Rail Transit Alignment Design   49Elevated(Guidewa...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   50Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   51   Underground   (Tun...
Light Rail Transit Facilities                  Design Course   Light Rail Transit Alignment Design   52Below Ground - Depr...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   53Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   54Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   55Horizontal Alignment ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   56Horizontal Alignment ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   57
Light Rail Transit Facilities                  Design Course   Light Rail Transit Alignment Design   58Horizontal Alignmen...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   59Horizontal Alignment ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   60
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   61Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design          62Vertical Align...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   63Vertical Alignment   ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   64Vertical Alignment   ...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   65Light Rail Transit Al...
Light Rail Transit Facilities                Design Course   Light Rail Transit Alignment Design   66In-Street Impacts and...
Light Rail Transit Facilities                    Design Course   Light Rail Transit Alignment Design   67    Light Rail Tr...
Light Rail Transit Facilities                Design Course    Light Rail Transit Alignment Design   68                    ...
T5 alignment lackey
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T5 alignment lackey

  1. 1. 2Light Rail Transit Facilities Design Course Light Rail Alignment Design May 22, 2010 John A. Lackey, PE Senior Vice President David Evans and Associates, Inc.
  2. 2. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 3Light Rail Transit Alignment Design Discussion Topics • Design vehicle clearance and loading • Types of alignments and typical cross sections – Open track – In-street alignments – Adjacent to freight railroads – Elevated – Underground • Alignment Geometry
  3. 3. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 4Light Rail Transit Alignment Design Design Vehicle Clearance and Loading Vehicle characteristics and dimensions – Vehicle loads – Wheel/track relationship – Vehicle performance – Dynamic envelope – Guideway clearances
  4. 4. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 5General Vehicle Characteristics • Bi-directional • Articulated • Operated as coupled-trains • Three trucks, two axles per truck • Pantograph • High or low floor, or combination
  5. 5. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 6Accessibility
  6. 6. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 7Comparison of Light Rail Vehicles Sample subhead
  7. 7. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 8Light Rail Transit Alignment Design Design Vehicle Clearance and Loading – Vehicle characteristics and dimensions – Vehicle loads – Wheel/track relationship – Vehicle performance – Dynamic envelope – Guideway clearances
  8. 8. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 9Vehicle Loads •AW0 - Empty vehicle operating weight •AW1 - (Seated load) – Fully seated passengers + AWO •AW2 - (Design load) – Standing passengers at 4/m2 + AW1 •AW3 - (Crush load) – Standing passengers at 6/m2 + AW1 •AW4 - (Structure design load) – Standing passengers at 8/m2 + AW1
  9. 9. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 10
  10. 10. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 11Light Rail Transit Alignment Design Design Vehicle Clearance and Loading – Vehicle characteristics and dimensions – Vehicle loads – Wheel/track relationship – Vehicle performance – Dynamic envelope – Guideway clearances
  11. 11. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 12Wheel/Track Relationship • Vehicle wheel profile • Rail profile • - • Curved track
  12. 12. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 13
  13. 13. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 14
  14. 14. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 15
  15. 15. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 16Light Rail Transit Alignment Design Design Vehicle Clearance and Loading – Vehicle characteristics and dimensions – Vehicle loads – Wheel/track relationship – Vehicle performance – Dynamic envelope – Guideway clearances
  16. 16. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 17 Vehicle Performance• Suspension – Primary – Secondary• Other loads affecting performance – Trucks – Load leveling• Performance on alignment – Accel/decel – Operating speed – Track curvature and gradient – Train size
  17. 17. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 18Light Rail Transit Alignment Design Design Vehicle Clearance and Loading – Vehicle characteristics and dimensions – Vehicle loads – Wheel/track relationship – Vehicle performance – Dynamic envelope – Guideway clearances
  18. 18. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 19Dynamic Envelope • VDE • Other factors: – Overhang on curves – Lean due to suspension, track superelevation – Track and wheel wear – Wheel/track spacing – Passenger loading • Maintenance values: – Lateral wheel wear - – Wheel-to-rail side play - – Radial wheel wear -
  19. 19. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 20
  20. 20. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 21Light Rail Transit Alignment Design Design Vehicle Clearance and Loading – Vehicle characteristics and dimensions – Vehicle loads – Wheel/track relationship – Vehicle performance – Dynamic envelope – Guideway clearances
  21. 21. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 22Guideway Clearances CE = VDE + OWF + RC – CE - Clearance Envelope – VDE - Vehicle Dynamic Envelope – OWF - Other Wayside Factors – RC - Running Clearance
  22. 22. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 23CE = VDE + OWF + RC OWF = CT + MT + CW – CT - Construction Tolerance – MT - Maintenance Tolerance – CW - Chorded Construction of Walls • (effects of track curvature and superelevation)
  23. 23. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 24Guideway Clearances • CT = allowable deviations from design positions – Track - – Poles, signal equipment - – Walls - • MT = allowable deviations from constructed condition: – Ballasted track - – Embedded track or Direct Fixation - – Lateral rail wear - – Vertical tolerance - – Cross level variance, ballasted - – Cross level variance, DF - • CW = effects of track curvature and superelevation
  24. 24. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 25
  25. 25. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 26
  26. 26. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 27CE = VDE + OWF + RC RC = Running Clearances: – RC to signals, signs, poles, etc. - – RC to emergency walkway envelope - – RC to bridge parapet, walls, other structures - – -
  27. 27. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 28Track at Station Platform
  28. 28. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 29
  29. 29. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 30Light Rail Transit Alignment Design Types of Alignments and Typical Cross Sections – Open Track – In-Street Alignments – Adjacent to Freight Railroads – Elevated – Underground
  30. 30. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 31Typical Ballasted Section
  31. 31. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 32Open Track Ballasted
  32. 32. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 33Typical LRT Median
  33. 33. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 34Open Track Ballasted
  34. 34. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 35Open Track Direct Fixation (DF)
  35. 35. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 36Open Track Direct Fixation
  36. 36. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 37Open Track Direct Fixation
  37. 37. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 38Light Rail Transit Alignment Design Types of Alignments and Typical Cross Sections – Open Track – In-Street Alignments – Adjacent to Freight Railroads – Elevated – Underground
  38. 38. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 39In-Street Alignments Embedded Track (Paved)
  39. 39. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 40In-Street Alignments Embedded Track (Paved)
  40. 40. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 41In-Street Alignments Embedded Track (Paved)
  41. 41. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 42Light Rail Transit Alignment Design Types of Alignments and Typical Cross Sections – Open Track – In-Street Alignments – Adjacent to Freight Railroads – Elevated – Underground
  42. 42. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 43Adjacent to Freight Railroads
  43. 43. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 44Adjacent to Freight Railroads
  44. 44. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 45Adjacent to Freight Railroads Grade Separation
  45. 45. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 46Adjacent to Freight Railroads Grade Separation
  46. 46. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 47Light Rail Transit Alignment Design Types of Alignments and Typical Cross Sections – Open Track – In-Street Alignments – Adjacent to Freight Railroads – Elevated – Underground
  47. 47. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 48Elevated (Bridges)
  48. 48. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 49Elevated(Guideway and Station)
  49. 49. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 50Light Rail Transit Alignment Design Types of Alignments and Typical Cross Sections – Open Track – In-Street Alignments – Adjacent to Freight Railroads – Elevated – Underground
  50. 50. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 51 Underground (Tunnel)
  51. 51. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 52Below Ground - Depressed
  52. 52. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 53Light Rail Transit Alignment Design Alignment Geometry – Design Criteria and Standards – Horizontal Alignment – Vertical Alignment – In-Street Running Impacts and Considerations – Station Requirements
  53. 53. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 54Light Rail Transit Alignment Design Alignment Geometry – Design Criteria and Standards – Horizontal Alignment – Vertical Alignment – In-Street Running Impacts and Considerations – Station Requirements
  54. 54. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 55Horizontal Alignment • Clearances • Speed • Tangents • Circular Curves • Superelevation • Spiral Transitions • Special Track
  55. 55. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 56Horizontal Alignment Superelevation
  56. 56. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 57
  57. 57. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 58Horizontal Alignment Special Track
  58. 58. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 59Horizontal Alignment Special Track – Precurved Rail • – Restraining Rail • – Emergency Guard Rail – Turnouts and Crossovers
  59. 59. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 60
  60. 60. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 61Light Rail Transit Alignment Design Alignment Geometry – Design Criteria and Standards – Horizontal Alignment – Vertical Alignment – In-Street Running Impacts and Considerations – Station Requirements
  61. 61. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 62Vertical Alignment Profile Grades Desirable Absolute Condition Maximum Maximum Maximum Mainline Track 3.5% 5.0% 7.0% Stations 0/5% 3.0% 4.5% Yard 0.0% 0.5% 1.0% Storage Track 0.0% 0.25% 0.5% Minimum grade for drainage = 0.2%
  62. 62. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 63Vertical Alignment Vertical Curves Minimum Length as function of speed: – L = 70 (G1 - G2) for V > 35 – L = 40 (G1 - G2) for 15 < V < 35 – L = 20 (G1 - G2) for V < 15 Minimum length of any vertical curve: – Desirable – Minimum – Absolute
  63. 63. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 64Vertical Alignment Other Considerations – Station platforms: • Tangent grade 0 % to 2.0 % • – Combined vertical and horizontal curves • • •
  64. 64. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 65Light Rail Transit Alignment Design Alignment Geometry – Design Criteria and Standards – Horizontal Alignment – Vertical Alignment – In-Street Running Impacts and Considerations – Station Requirements
  65. 65. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 66In-Street Impacts and Considerations• Operational policies• Physical and design constraints• Right-of-Way
  66. 66. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 67 Light Rail Transit Alignment Design Alignment Geometry– Design Criteria and Standards– Horizontal Alignment– Vertical Alignment– In-Street Running Impacts and Considerations– Station Requirements
  67. 67. Light Rail Transit Facilities Design Course Light Rail Transit Alignment Design 68 Questions

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