3 ms·

The rail grinding noise of those Mark 1 Skytrain cars are really something. They literally made my ears hurt. For reference New York's subway rail noise never m

The rail grinding noise of those Mark 1 Skytrain cars are really something. They literally made my ears hurt. For reference New York's subway rail noise never made my ears hurt that much. The explanation I read online is that Translink (the transport authority) lost one of the 2 rail grinders they contracted, and had to buy a grinder for use. So for a few years, while waiting for the grinder to arrive, the rails were not getting the regular grinding needed that'd lessen the wheels-on-rail noise. An unverified rumor I heard was that Translink cheaped out and bought a batch of substandard rails that are softer than needed. This means the rails wear out and become out of spec faster. The issue was compounded by the fact that the softer rails were used to replace a large portions of routes with sharp curves. The rolling stocks use linear induction propulsion, which means there is no electric motor on the train. The trains are very light as a result and require different maintenance.

xattt 2y ago
> LIM A few thoughts: The downside to LIMs is that they have ann unexpected derailment/failure mode (1), as manifested by the 2023 SRT derailment. Briefly, the magnetic repulsion/attraction forces of an accelerating train caused a section of the reaction rail to catch on the train, which catapulted a train car. I’ll also mention used to live near the SRT. They were still great and quirky around the 10 year mark. However, the Mark Is didn’t age well. They just got louder and louder. They also became more and more susceptible to severe weather, to the point they were run in manual mode (versus ATO) with every snow storm. (1) https://stevemunro.ca/2024/01/31/the-scarborough-rt-derailment-technical-reports/ https://stevemunro.ca/2024/01/31/the-scarborough-rt-derailme...
wesapien 2y ago
I agree. From what I can recall, the Expo line is just as loud as riding in a Tokyo subway. Good thing I always have an in-ear or NC headphone with me when I travel.
- PeterStuer 2y ago
  If that is passive hearing protection through isolation you are probably good. But do the 'active' NC headphones actualy prevent hearing damage?
shiroiushi 2y ago
>The rolling stocks use linear induction propulsion, which means there is no electric motor on the train. This sentence makes no sense at all. A linear induction motor is a type of electric motor.
rob74 2y ago
Grinding the rails only helps against roughness of the upper surface of the rail (which causes a "roaring" noise - https://en.wikipedia.org/wiki/Railgrinder#Rail_corrugation https://en.wikipedia.org/wiki/Railgrinder#Rail_corrugation). The most annoying noise in my experience is the screeching noise when going around curves (or on badly maintained straight tracks) - this can best be solved by using flange lubrication (https://centrallubrication.com/en/lubrication-techniques/wheel-flange-lubrication.php https://centrallubrication.com/en/lubrication-techniques/whe...).
- Doxin 2y ago
  On a well designed track the flanges should not ever rub. Of course with light rail you'll sometimes run into a problem where a curve needs to be tighter than can be done without flange rubbing. The Amsterdam tramways have a couple places like that and the noise is godawful.

xattt 2y ago

> LIM A few thoughts: The downside to LIMs is that they have ann unexpected derailment/failure mode (1), as manifested by the 2023 SRT derailment. Briefly, the magnetic repulsion/attraction forces of an accelerating train caused a section of the reaction rail to catch on the train, which catapulted a train car. I’ll also mention used to live near the SRT. They were still great and quirky around the 10 year mark. However, the Mark Is didn’t age well. They just got louder and louder. They also became more and more susceptible to severe weather, to the point they were run in manual mode (versus ATO) with every snow storm. (1) https://stevemunro.ca/2024/01/31/the-scarborough-rt-derailment-technical-reports/ https://stevemunro.ca/2024/01/31/the-scarborough-rt-derailme...

wesapien 2y ago

I agree. From what I can recall, the Expo line is just as loud as riding in a Tokyo subway. Good thing I always have an in-ear or NC headphone with me when I travel.

PeterStuer 2y ago
If that is passive hearing protection through isolation you are probably good. But do the 'active' NC headphones actualy prevent hearing damage?

shiroiushi 2y ago

>The rolling stocks use linear induction propulsion, which means there is no electric motor on the train. This sentence makes no sense at all. A linear induction motor is a type of electric motor.

rob74 2y ago

Grinding the rails only helps against roughness of the upper surface of the rail (which causes a "roaring" noise - https://en.wikipedia.org/wiki/Railgrinder#Rail_corrugation https://en.wikipedia.org/wiki/Railgrinder#Rail_corrugation). The most annoying noise in my experience is the screeching noise when going around curves (or on badly maintained straight tracks) - this can best be solved by using flange lubrication (https://centrallubrication.com/en/lubrication-techniques/wheel-flange-lubrication.php https://centrallubrication.com/en/lubrication-techniques/whe...).

Doxin 2y ago
On a well designed track the flanges should not ever rub. Of course with light rail you'll sometimes run into a problem where a curve needs to be tighter than can be done without flange rubbing. The Amsterdam tramways have a couple places like that and the noise is godawful.