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| Re: 2nd Ave Subway Setback (811580) | |||
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Re: 2nd Ave Subway Setback |
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Posted by AEM-7AC #901 on Wed Jul 22 02:40:15 2009, in response to Re: 2nd Ave Subway Setback, posted by Easy on Wed Jul 22 01:20:38 2009. In LA we can only fit three cars on a city blockSo in other words, you're going to inflate costs considerably to build a heavy rail system with full blown grade separation and tunnels that may never need 20 tph (trains every three minutes) because you're unwilling to cut off small side streets? The benefit of the light rail system is that you can build tunnels as needed, so one can use street running in low density areas while using tunnelling in higher density areas. There is no such flexibility for heavy rail systems which leave them with an all or nothing approach to extensions, which is important given the limited funding available from municipal, state, and federal governments. BTW, Light Rail: TPH - 30 Cars per train - 4 People per car - 230 30 X 4 X 230 = 27600 Of course, you can achieve thirty trains per hour with light rail since the savings from avoiding full blown heavy rail construction could be spent on supplemental lines and branches that serve other areas and prevent riders from enduring long bus rides to get to your solitary heavy rail line while providing for one seat rides to the core and minimizing transfers to other lines. Plus with four cars per train, the minimum spacing between trains is much narrower than in a heavy rail system due to the shorter length of the sets requiring less time to clear blocks and interlockings, thus allowing for more trains with a proper signalling system and well-designed switches at terminals. |
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