texassubwayfan555 Posted August 14, 2022 Share #1 Posted August 14, 2022 (Sorry if I made a mistake as this is my first real post.) Is it possible for any NTT to only run with air/friction brakes and no dynamic brakes? And are there any videos of it? 0 Quote Link to comment Share on other sites More sharing options...
bulk88 Posted August 16, 2022 Share #2 Posted August 16, 2022 The stations will smell like a burning carpet from all the burning brake pads. Cars without traction already used friction braking completely instead of in the last 5 miles per hour before absolute zero speed. There's a unique squeal and smell to it. 0 Quote Link to comment Share on other sites More sharing options...
texassubwayfan555 Posted August 16, 2022 Author Share #3 Posted August 16, 2022 Are there any online videos of a single car "without traction"? (I assume you mean the car has broken motors) 0 Quote Link to comment Share on other sites More sharing options...
Biggie Posted August 16, 2022 Share #4 Posted August 16, 2022 On 8/14/2022 at 5:12 PM, texassubwayfan555 said: (Sorry if I made a mistake as this is my first real post.) Is it possible for any NTT to only run with air/friction brakes and no dynamic brakes? And are there any videos of it? On tech trains the brake control unit (BCU) has a separate unit mounted called the Friction Brake Electronic Unit which has a link from the friction brakes to the propulsion system and many other networks as well. This controls friction braking on each truck separately. When it is detected that the propulsion system cannot compensate for the brake effort requested (dynamic braking is energy used to retard the train when speeds are greater than 7 mph) friction brakes are instead applied. Pretty much when a motor is dead frictions are the only braking available on the truck with the fault. You'll hear and smell it as well. 2 Quote Link to comment Share on other sites More sharing options...
texassubwayfan555 Posted August 16, 2022 Author Share #5 Posted August 16, 2022 27 minutes ago, Biggie said: each truck separately I was still wondering if there was a documented occurrence of only friction brakes on the whole train. I heard the braking system is designed to be able to operate with just air brakes if needed. Thanks for the detailed answer and the video still. 0 Quote Link to comment Share on other sites More sharing options...
Kamen Rider Posted September 9, 2022 Share #6 Posted September 9, 2022 that's called "Going BIE" (Brakes in Emergency), which skips the dynamic and slams on the friction breaks, other than that it won't happen because would never allow the trains to operate if that much of the dynamic system was offline that the whole train's out. 0 Quote Link to comment Share on other sites More sharing options...
texassubwayfan555 Posted September 9, 2022 Author Share #7 Posted September 9, 2022 Yes I know about the emergency brakes. 2 hours ago, Kamen Rider said: would never allow the trains to operate if that much of the dynamic system was offline I thought maybe there were some rare times when a NTT would operate with no dynamic brakes, but I guess the MTA would rather take a train out of service than do that. Although I have seen videos on another transit system (Singapore MRT) of trains operating without dynamic brakes: here, here, and here. 0 Quote Link to comment Share on other sites More sharing options...
RTOMan Posted September 12, 2022 Share #8 Posted September 12, 2022 On 9/9/2022 at 3:36 PM, texassubwayfan555 said: I thought maybe there were some rare times when a NTT would operate with no dynamic brakes, but I guess the MTA would rather take a train out of service than do that. No instance none period.... Yes they would and this isn't Singapore... 1 Quote Link to comment Share on other sites More sharing options...
Kamen Rider Posted September 13, 2022 Share #9 Posted September 13, 2022 to be honest, Texas, there are a whole host of otherwise simple problems that require us to take a train out of service. If I have both door panels in a single doorway cut out, we have to take the train out of service. If the PA breaks. Out of Service. if any of the train's circuit breakers trips twice, Out of Service. So if the main breaking system on an NTT class train is offline, you know the train is gonna be out of service. 0 Quote Link to comment Share on other sites More sharing options...
texassubwayfan555 Posted September 13, 2022 Author Share #10 Posted September 13, 2022 (edited) Who even makes some of these decisions? And I thought the air brakes were the main brake system. Edited September 13, 2022 by texassubwayfan555 0 Quote Link to comment Share on other sites More sharing options...
RTOMan Posted September 18, 2022 Share #11 Posted September 18, 2022 On 9/13/2022 at 1:44 PM, texassubwayfan555 said: Who even makes some of these decisions? And I thought the air brakes were the main brake system. Not with New Tech dynamic braking is what slows the train down air brakes stop it. 2 Quote Link to comment Share on other sites More sharing options...
texassubwayfan555 Posted September 20, 2022 Author Share #12 Posted September 20, 2022 Semi related question: Why do the air/friction brakes sound so bad on the NTTs? Even when some SMEE sets had squeaky brakes, it was nowhere near as bad as the brakes on the New Tech Trains. Is it due to poor maintenance or just the type of brake used? 0 Quote Link to comment Share on other sites More sharing options...
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