[Archive] Questions on MRT/LRT

• Samuel Lee

  1 Jan 10, 20:38

  Originally posted by nganmatthias:

  
  To make matters worse the drivers are driving very fast nowadays.

  Funny you leh, people want to get destination fast so they take trains, and you expect the train drive slow slow, how slow do you want? 10kmh? or 20kmh?

• Khairiano

  1 Jan 10, 21:13

  Reading from previous page.. some people asking and talking about flat wheels..
  currently mojority of the train got flat wheels..
  
  okey.. i explain about flat wheels..
  
  Flat Wheels or Flat Spots is a fault in railway wheel shape. it occurs when the train wheelset is dragged along the rail after it has come to a standstill and are usually caused by faulty brakes or wheelset bearings and also by use of the emergency brake, or slip and slide conditions that causes wheels to lock up while the train is still moving.

  The consequences of the flat wheels if the spots is small, the rail vehicle will be able to continue being used. The fault is removed later in the wheelset turning process, using a wheel lathe because of the heat suffered while being dragged along the rail and the impacts suffered afterward, these wheels are more likely to break due to changes in the alloy structure.
  
  When the spots is very large, strands of molten metal may have got stuck on one side of the flat spot, making it impossible to turn the wheel due to insufficient clearance between the rolling surface and the brake block. In this case, the wheelset must be replaced immediately.

   

  In extreme cases, a wheel with an untreated flat spot can damage the track and cause a derailment.

• Interception_7

  1 Jan 10, 23:31

  Originally posted by Samuel Lee:

  So when it gets profiled too much, the wheel will be getting smaller and smaller and must replace or else it will derailed?

  
  Like I said, 780mm is the minimum, anything less than that, they have to change it to a new one.

• Interception_7

  1 Jan 10, 23:36

  Originally posted by nganmatthias:

  
  To make matters worse the drivers are driving very fast nowadays.

  
  Fast? How fast? 70-80km/h? Isn't that the normal speed for the trains?

  With regular checks by the maintenance crew, I doubt such tragedy would happen..

• Samuel Lee

  1 Jan 10, 23:51

  Originally posted by Interception_7:

  
  Like I said, 780mm is the minimum, anything less than that, they have to change it to a new one.

  Will this happen to NEL and CCL?

• Samuel Lee

  1 Jan 10, 23:52

  Originally posted by Interception_7:

  
  Fast? How fast? 70-80km/h? Isn't that the normal speed for the trains?

  With regular checks by the maintenance crew, I doubt such tragedy would happen..

  +1, trains in design can go to 90kmh but service rarely to 80kmh.

• Interception_7

  1 Jan 10, 23:54

  Originally posted by Samuel Lee:

  Will this happen to NEL and CCL?

  
  Yes it does.. In fact every single trains in the world...

• Interception_7

  1 Jan 10, 23:55

  Originally posted by Samuel Lee:

  +1, trains in design can go to 90kmh but service rarely to 80kmh.

  
  reach 80 got la.. i use gps and calculate, abt 78.3km/h leh hahaha

  anyway standard gauge can go faster than 90.. here want go fast also cannot.. distance between stations is not that big...

• NickL_C151

  1 Jan 10, 23:59

  Originally posted by Interception_7:

  
  Yes it does.. In fact every single trains in the world...

  Except trains that use magnetic levitation or rubber tyres.

• NickL_C151

  2 Jan 10, 00:01

  Originally posted by Interception_7:

   

  anyway standard gauge can go faster than 90.. here want go fast also cannot.. distance between stations is not that big...

  Actually, the speed limit of 80km/h is because of the third rail. NEL is capable of handling speeds of up to 140km/h if I'm not mistaken.

• Samuel Lee

  2 Jan 10, 00:03

  Originally posted by NickL_C151:

  Actually, the speed limit of 80km/h is because of the third rail. NEL is capable of handling speeds of up to 140km/h if I'm not mistaken.

  I have seen the internals on passenger service train before, it is up to 100kmh. I think if one day there is a "C851" train (You see, we got C151, C651 and C751B running the same system), it is possible.

• NickL_C151

  2 Jan 10, 00:05

  Originally posted by Samuel Lee:

  I have seen the internals on passenger service train before, it is up to 100kmh. I think if one day there is a "C851" train (You see, we got C151, C651 and C751B running the same system), it is possible.

  Speedometers can run into very high digits but the vehicle may or may not hit those digits.

  What do you mean by C851? Our next batch of Changchun Railway Corp. trains are labelled C151A btw.

• Interception_7

  2 Jan 10, 00:10

  Originally posted by NickL_C151:

  Actually, the speed limit of 80km/h is because of the third rail. NEL is capable of handling speeds of up to 140km/h if I'm not mistaken.

  IF only it can run at that speed.. but here the station distance not that far, so no point accelerating to 140 after awhile need to brake.. hahaha

   

  Originally posted by NickL_C151:

  Except trains that use magnetic levitation or rubber tyres.

  
  err... yesyes hahahaha

• E5

  2 Jan 10, 09:43

  For local lines, 100km/h is the maximum speed possible on some stretch of the line which has large distance in between stations. It makes no sense to travel any faster than that because on some part of the track, we're pushing the train very hard on the curves (Meaning, any faster will cause derailment). Anyway here are some statistics if you guys are curious;

  Singapore
  NSL: 80km/h (ATO + ATC + ATP) (Standard Gauge 1435mm)
  EWL: 80km/h (ATO + ATC + ATP)(Standard Gauge 1435mm)
  CCL: 80km/h (CBTC + ATC + ATP)(Standard Gauge 1435mm)
  NEL: 85km/h (CBTC + ATC + ATP)(Standard Gauge 1435mm)

  Japan
  Tsukuba Express Line: 130km/h (ATO + ATC)(Narrow Gauge 1067mm)
  Keikyu Main Line: 120km/h (C-ATS)(Standard Gauge 1435mm)
  Tokyu Toyoko Line: 110km/h (CS-ATC)(Narrow Gauge 1067mm)
  Kyoto Line: 130km/h (ATS-P)(Narrow Gauge 1067mm)
  Tokaido/Sanyo Shinkansen: 300km/h (ATC-NW)(Standard Gauge 1435mm)
  Tohoku Shinkansen: 320km/h (DS-ATC)(Standard Gauge 1435mm)

  The speed listed above is the top speed permitted in each of it's individual lines as define by ATC or section limits.

  And to add to the point Interception_7 has said, in AM fast mode, train will hover at the 75~79.9km/h range. However in CM, train will occassionally break the 80km/h limit and when that happen, ATP will overrule the ATC and bring the train to a complete halt using EB (4.5km/h/s).

• Samuel Lee

  2 Jan 10, 16:38

  Originally posted by NickL_C151:

  Speedometers can run into very high digits but the vehicle may or may not hit those digits.

  What do you mean by C851? Our next batch of Changchun Railway Corp. trains are labelled C151A btw.

  Yep, I know that, well the C851 is a fiction train as of now, i mean at 1990, who would thought of C151A or C751B trains? If the next batch of NEL train, I believe it can support that speed but I dont see the point.

• BiminiRosy

  2 Jan 10, 16:53

  Originally posted by Samuel Lee:

  Yep, I know that, well the C851 is a fiction train as of now, i mean at 1990, who would thought of C151A or C751B trains? If the next batch of NEL train, I believe it can support that speed but I dont see the point.

  Do you mean C951 or C830?

• Samuel Lee

  2 Jan 10, 17:35

  Originally posted by BiminiRosy:

  Do you mean C951 or C830?

  No, neither. I mean a as of now non existent train that is up for imagination

   

  C951 is Downtown Line and C830 is Circle line trains.

• Samuel Lee

  2 Jan 10, 18:41

  I have a question on BPLRT

   

  1: Is there any chance to see 2 trains couple together on Ten Mile Junction

  2: What is the use of Platform 2 in Choa Chu Kang anyway

  3: It seemed that only train set 112 is the one going to Route C (Ten Mile Junction) perm, is it true? (Somehow I manage to alight at Ten Mile Junction, let the train leave and see the trainset number for the next train, which is the same, 112)

• jayh272416

  2 Jan 10, 18:46

  Originally posted by Samuel Lee:

  I have a question on BPLRT

  2: What is the use of Platform 2 in Choa Chu Kang anyway

  3: It seemed that only train set 112 is the one going to Route C (Ten Mile Junction) perm, is it true? (Somehow I manage to alight at Ten Mile Junction, let the train leave and see the trainset number for the next train, which is the same, 112)

  2. probably reserve track. Saw a faulty train park there before, engineers were on board

  3. for that day, your 112 is the only train there. There is no fixed train on the C route, ive seen various trains like 107, 105, 110 operating C before. C has only one train per day anyway.

• Samuel Lee

  2 Jan 10, 18:55

  Originally posted by jayh272416:

  2. probably reserve track. Saw a faulty train park there before, engineers were on board

  3. for that day, your 112 is the only train there. There is no fixed train on the C route, ive seen various trains like 107, 105, 110 operating C before. C has only one train per day anyway.

  I see, for your point 3, it is interesting given that it seemed troublesome to pull the stickers and paste on to it when a train is added / removed from route C.

• jerryonhere

  2 Jan 10, 19:25

  Originally posted by Samuel Lee:

  I have a question on BPLRT

   

  1: Is there any chance to see 2 trains couple together on Ten Mile Junction

  2: What is the use of Platform 2 in Choa Chu Kang anyway

  3: It seemed that only train set 112 is the one going to Route C (Ten Mile Junction) perm, is it true? (Somehow I manage to alight at Ten Mile Junction, let the train leave and see the trainset number for the next train, which is the same, 112)

  1. Nope.

  2. You mean Platform 1? Or am I wrong? Oh well, it's reserved for trains when they broke down, which for some reason these trains are already spoiling.

  3. False. Any train can service on Service C.

• jayh272416

  2 Jan 10, 19:28

  Originally posted by Samuel Lee:

  I see, for your point 3, it is interesting given that it seemed troublesome to pull the stickers and paste on to it when a train is added / removed from route C.

  yeah. quite true lol

• Samuel Lee

  2 Jan 10, 19:29

  Originally posted by jerryonhere:

  1. Nope.

  2. You mean Platform 1? Or am I wrong? Oh well, it's reserved for trains when they broke down, which for some reason these trains are already spoiling.

  3. False. Any train can service on Service C.

  Thanks to jayh272416 and jerryonhere's swift reply, but just curious will they add more trains in peak hours like East West Line (For the whole line, obviously, I dont refer to Route C)?

   

  Regardless, if a train has serviced for the day, not in the context of spoilt, and wanted to return to depot, it uses Platform 2 right?

• jayh272416

  2 Jan 10, 19:32

  Originally posted by Samuel Lee:

  Thanks to jayh272416 and jerryonhere's swift reply, but just curious will they add more trains in peak hours like East West Line (For the whole line, obviously, I dont refer to Route C)?

   

  Regardless, if a train has serviced for the day, not in the context of spoilt, and wanted to return to depot, it uses Platform 2 right?

  for your first point, i did notice the trains with two carriages coupled together. that should be the peak hour solution, but im not sure if the frequency is improved

  serviced for the day.. im not sure.

• Samuel Lee

  2 Jan 10, 19:38

  Originally posted by jayh272416:

  for your first point, i did notice the trains with two carriages coupled together. that should be the peak hour solution, but im not sure if the frequency is improved

  serviced for the day.. im not sure.

  Ok, then if non peak hour, is it that 2 trains coupled together all go back depot to decouple and one of them come out? (Or there is 2 sets of trains, 1 of them is non coupled and the other is coupled train, thus in peak hours coupled train is shown or else they are hidden in depot)
  
  
  Is there any coupling rules for that (I.e: 110 must coupled with 111 and not 119)