|Re: THE STUDY RELEASED-Re: Study of old Rockaway rail line’s revival back on track (1526434)|
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Re: THE STUDY RELEASED-Re: Study of old Rockaway rail line’s revival back on track
Posted by italianstallion on Wed Oct 9 19:10:04 2019, in response to Re: THE STUDY RELEASED-Re: Study of old Rockaway rail line’s revival back on track, posted by Bill Newkirk on Wed Oct 9 16:06:46 2019.One serious issue with using the RIW for LIRR service is that the LIRR has told the consultants that the LIRR main linen is bac=sically full, regarding capacity, and thus adding RBB service would require eliminating existing trains.
"The LIRR Service Planning staff explained that if RBB train service were to operate, there would need to be an existing tradeoff with existing service. It is the common practice of the LIRR service planning group to show the impact on existing service by eliminating trains. This is most commonly done when introducing a new service plan to a line that is already at capacity. In order to provide slots for the RBB service, the SYSTRA team made certain assumptions (listed below) and took trains off short headway branches in order to minimize system-wide impacts. LIRR staff cites that, as a benchmark, a 12-car commuter train (operating on other LIRR branches) carries a seated capacity of 1,272 passengers. If 15-minute RBB service frequencies are to be provided, it is possible that 5,000 customers per hour could be displaced. Based upon the current assessment, during the peak hours of commutation, in the peak direction, four trains currently carrying commuters would be eliminated to accommodate LIRR RBB service. Additionally, at least two commuter trains would need to be eliminated for the reverse (non- peak direction) during the same period. This could mean the displacement of as many as 7,500 current LIRR passengers. As part of this assessment, it was assumed that displacement of current trains would come from the Hempstead, Huntington, Ronkonkoma and Babylon branches, with each branch losing one train during each of the peak hours weekdays in the peak direction.
In order to incorporate future LIRR RBB service, the resulting LIRR branches will experience the following effects:
• Ronkonkoma Branch would have the number of Manhattan bound trains reduced from 25 to 21, or 10 minute headways to 11 minute headways.
• Port Jefferson/Huntington Branch would have the number of Manhattan bound trains reduced from 17 to 13, or 14 minute headways to 18 minute headways.
• Hempstead Branch would have the number of Manhattan bound trains reduced from 10 to 8, or 24 minute headways to 30 minute headways.
• Babylon Branch would have the number of Manhattan bound trains reduced from 36 to 30, or 7 minute headways to 8 minute headways.
• For eastbound reverse peak trains, Huntington Branch was reduced from 5 to 4 peak period trips from Manhattan and Ronkonkoma was reduced from 8 to 7 peak period trips from Manhattan."