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| Re: Latest updates: R-179 order saga, R-160 CBTC for (L) line & special reports ... (1134635) | |||
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Re: Latest updates: R-179 order saga, R-160 CBTC for (L) line & special reports ... |
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Posted by Stephen Bauman on Tue Jan 24 19:37:19 2012, in response to Re: Latest updates: R-179 order saga, R-160 CBTC for (L) line & special reports ..., posted by J trainloco on Tue Jan 24 18:21:01 2012. I'm suprised you didn't get it right. It's one of your favorite whipping boys when you criticize CBTC.The basic root answer is money. There's the problem of compatibility between the Digital Communication System (DCS) used on the 14th Street Line with those that will be used on all other lines. NYCT allowed Siemens to substitute its own proprietary DCS for an industry standard. One of the two follower contractors dropped out as a result of this decision. The other offered to reverse engineer Siemen's DCS but NYCT told them to buy them from Siemens. There are two problems: Siemen's DCS receivers and transmitters cost 100 times more than industry standard receivers and transmitters; Siemens cannot supply any more receivers and transmitters because they never made them. They bought them from a sub-contractor. That sub-contractor no longer makes this receiver/transmitter because it is obsolete and nobody is buying it. That sub-contractor builds receiver/transmitters and relies on volume sales. The 32 receiver/transmitters that they are now buying isn't exactly volume in the electronics industry. The big fun will be when CBTC comes to the lines leading to the Coney Island yards. The two CBTC implementations will not be compatible. The 14th Street train will not be recognized on any Southern Division tracks. That means the CBTC will revert to its Auxilliary Wayside System (AWS), which will enforce a 20 minute headway. That will cause delays even during night time hours. Why did Siemens propose the change? $$$$ - the proprietary DCS is integrated into their wayside and onboard computers. This locks NYCT into the Siemens technology. Why isn't NYCT going with this same Siemens technology for other CBTC implementations? $$$$ - no other transit system agreed to Siemen's Three Card Monte DCS substitution. Consequently, all other CBTC implementations are considerably less expensive than the 14th Street Line. These other systems are using other vendors and getting lower quotes. That's why I gave the brief answer as $$$$$. |
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