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BANGKOK 18 July 2019 07:57
josephbloggs

BTS Onnut Slowness

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Posted (edited)

Hi,

 

Seeing as we have a few posters with excellent knowledge of the BTS I would like to ask this question:

 

For the last few days the trains running in to town slow down to a crawl between Onnut and Phrakhanong.  They creep along at maybe 5mph between stations at the point where the track takes a slight bend to follow Sukhumvit and go over the khlong, for (I'm guessing) maybe 300-400 metres.  It doesn't do this in the other direction - they stay normal speed.

 

Why?

 

Edited by josephbloggs
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If its in peak hour then its due to seperation of trains running so frequently

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3 minutes ago, madmen said:

If its in peak hour then its due to seperation of trains running so frequently

No, it's not that.  It is at all times of the day (that I have been on it) and always at the same place.

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I can't specifically address the location you're asking about.

 

But oddly in parallel, for the last several months until recently, the exact same was happening on the Sukhumvit line, about half way between the Ploenchit and Nana stations, as the trains headed toward Nana station. The trains would suddenly slow just like you said and crawl into the Nana station. Then after that, proceed at normal speeds toward Asoke.

 

At all times of the day. And with no train ahead that the slowing train was having to wait for. Never had done like that any time before in all the years I've been traveling on that line. Began a few month ago, and continued exactly the same until the past several week. Now, back to normal, the trains run at normal speed every time coming into the Nana station.

 

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Posted (edited)

Track condition? They do deteriorate.

Electrical loading on the system? It needs maintenance too, maybe a tranny offline for repairs?

I guess it could be for a number of reasons. perhaps any issues have been sorted out and the system is back to normal now.

Ask Crossy he plays with train sets and may be able to give some insight.

Edited by emptypockets
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8 hours ago, TallGuyJohninBKK said:

I can't specifically address the location you're asking about.

 

But oddly in parallel, for the last several months until recently, the exact same was happening on the Sukhumvit line, about half way between the Ploenchit and Nana stations, as the trains headed toward Nana station. The trains would suddenly slow just like you said and crawl into the Nana station. Then after that, proceed at normal speeds toward Asoke.

 

At all times of the day. And with no train ahead that the slowing train was having to wait for. Never had done like that any time before in all the years I've been traveling on that line. Began a few month ago, and continued exactly the same until the past several week. Now, back to normal, the trains run at normal speed every time coming into the Nana station.

 

the 'slow' train does not have to be directly infront of your train for your train to beslowed, its the entire line, the system tries to space apart the trains so they are not jaming up right infront of the Siam station.. try using the first train at 5.45am and i doubt it will be slowing over that onnut-phrakanong section

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2 hours ago, pkspeaker said:

the 'slow' train does not have to be directly infront of your train for your train to beslowed, its the entire line, the system tries to space apart the trains so they are not jaming up right infront of the Siam station.. try using the first train at 5.45am and i doubt it will be slowing over that onnut-phrakanong section

Nah it's not that.  Always exactly the same place, at all times of day, on all trains.  

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1 hour ago, josephbloggs said:

Nah it's not that.  Always exactly the same place, at all times of day, on all trains.  

 

That was my experience also...

 

Also, in terms of congestion on the line, IME, when the train needs to wait for a train ahead, they typically seem to just stop it ahead of the upcoming station and wait.

 

Like Joseph's description, mine was the same, slowing to a crawl and then moving forward at that speed at the same exact point on the line every time, any time of day, day after day, for a couple months....

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43 minutes ago, Crossy said:

rail worn out of tolerance perhaps (quite likely on a curve).

 

Interesting that both the final section heading from Ploenchit into Nana that I mentioned has a slight curve, as does the section Joseph mentioned heading into OnNut from Phrakanong.

 

But, FWIW, in both cases, the slowdowns were only occurring on one side of the track.... at least in my case on the Ploenchit into Nana trip. On the Nana heading to Ploenchit trip, no slowdown at all.

 

Perhaps as you say, it was a track specific issue that they finally remedied.

 

 

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Same thing for train going from Ploenchit to Nana. But not the reverse which makes it weird.

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3 minutes ago, TallGuyJohninBKK said:

 

Interesting that both the final section heading from Ploenchit into Nana that I mentioned has a slight curve, as does the section Joseph mentioned heading into OnNut from Phrakanong.

 

But, FWIW, in both cases, the slowdowns were only occurring on one side of the track.... at least in my case on the Ploenchit into Nana trip. On the Nana heading to Ploenchit trip, no slowdown at all.

 

Perhaps as you say, it was a track specific issue that they finally remedied.

 

 

Same, one side of the track only.

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Who cares about a little slowdown? I'm waiting for the day when a driver manages to run the train clear off the tracks. Hell, it's been eighteen years without a derailment on the BTS; SRT is streets ahead with almost one a week.

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Another BTS note if I can, I don't understand why BTS continues to use short trains if they can run longer trains at high peak hours. For years they have run 4 cars (carriages) and the platforms can accommodate 6. My point is this. I grew up in Manhattan, in New York. The subway runs 10 cars (the maximum the platform is designed for) and when it is late or off peak hours they would run 8 car and I can remember 6 cars on some lines in the other boroughs.

 

The BTS platforms are designed for 6 cars yet they always pack people into 4, and when they get to their destination, they're stressed and it can all be avoided with two additional cars each way. What's even worse is since they've installed those safety doors in some stations, they do not include the possibility for the 2 additional cars. If it is a coupling issue why would they build 6 car platforms and buy trains that can only couple once in a set of two, making 4 total, what's the logic?

 

You don't have to pay any more labor cost because it's still the same train just longer. What is the insane logic behind this 4 cars all day long? Can anyone shed some light on this madness? BTW Hong Kong runs long trains all day.

 

 

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10 hours ago, Crossy said:

There's likely a speed restriction on that section, possibly something has been found during the regular inspection of the track (yes, they do do regular maintenance), rail worn out of tolerance perhaps (quite likely on a curve).

 

Obviously replacing lumps of rail isn't a 5 minute job and needs planning and scheduling for out-of-hours working.

 

The issue will go away one day once the job has been completed.

You wouldn't want jumping the rail would you bad enough on terra fitma  

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