Presentation%20To%20Cherrywood%20Inquiry%20(Luas%20B1)

1
Presentation To Cherrywood Inquiry (Luas B1)

• Mark Gleeson BA BAI MSc MIEE
• Technical Officer
• Platform 11

2
Concerns

• Capacity
• Impact on existing passengers of Line B
• Design
• Road junctions
• Stop locations
• Route Choice
• Glencairn Vs Harcourt Street

3
Capacity (1)

• Existing Line B classic Dublin low density
• Relatively static population
• Higher density development on Line B1
• Glencairn
• Ballyogan
• Cherrywood

4
Capacity (2)

• RPA approach
• Increasing frequency from every 5 to every 3
  gives 67 increase
• Reliability with level crossings ?
• 40m to 50m gives 34
• Possible impact on performance
• Depends on platform lengths
• Combined gives 123
• Is that enough ??
• Is there sufficient capacity for the
• Next 5 years? Next 10 years?
• Line B already ahead of forecasts

5
Design - Clonlea

• Listed status could lead to delays
• Awkward CPO
• Legal challenges
• Could lead to an undue delay in the delivery of
  this project, with resultant impact on costs. In
  light of the ambitious targets laid down by
  Transport 21 this is of particular importance.
• Vertical alignment suggests possibility of cut
  cover
• Glencairn stop is on a significant hill

6
Design - Depot Access

• Still only one single track
• Red Cow, Fairview and Inchicore
• All at least 2 connections
• Best practice
• 2 derailments leading to disruption already

7
Design - Road Junctions

• Many road crossings at or near T junctions in
  Ballyogan and Glencairn
• Reduced visibility
• Traffic management issues
• Traffic queuing blocks tram line
• Classic yellow box problem
• T junctions are the most tricky of all level
  crossings

8
Design - Racecourse Stop

• Which racecourse ??
• Stop name ambiguous
• Location is distant from Leopardstown
• Quicker cheaper via Sandyford
• No local access provided
• Occasional status provides no local benefit

9
Design - Emergency Crossovers

• No emergency crossovers on the proposed 7.6km
  alignment.
• Line B, which is of similar length has 2
• At least one should be provided
• Later addition of a crossover may require
  permission of the Department of Transport.

10
Route Choice

• Harcourt Street route
• More direct
• Fewer at grade crossings
• Minimal disruption during construction
• However smaller catchment area
• Glencairn route
• Significant catchment and demand
• Archeological issues
• More CPO

11
Route - Sandyford - Central Park

• Selected alignment
• Alternative
• Continue on the Harcourt street alignment in
  parallel to the current depot to Brewery Road
  turn left and continue towards the Leopardstown
  roundabout

12
Route - Sandyford - Central Park

• Benefits
• Reduced land acquisition
• Provides full segregation
• Avoid Burton Hall Rd
• Awkward crossing
• FAAC electronics site
• Minimises disruption to existing Luas services
  during construction phase
• Provides access to depot from both north and
  south sides
• Maximises use of existing Harcourt Line