Atomic Systems

kev2003 wrote:happily the industry moved forward

rkk01 wrote:Could it ever run again???

Pragmatism says not, but the prototype HST has been revived and extinct steam classes reincarnated.
Of course, it's money and will power that makes the difference - just look at what happens in the world of rare warbirds...

But, from an engineering perspective, how dead is a dead APT???

deltic009 wrote:Much more on topic. An in-depth look at the APT-P, note the two drivers in the cab. It sounds (description of features etc) and looks fabulous.

https://train-simulator.com/apt-p-detail/

As an aside, regarding the trackside transponders for speed, depending how these work and if they're scenario specific, if we understand how they work might we be able to use them as a way of fudging limits for rolling stock below normal linespeed for use in scenarios I wonder??

Deffo my favourite shot, cracking detail in there.

APT_0009.jpg

Mr395008 wrote:

deltic009 wrote:Much more on topic. An in-depth look at the APT-P, note the two drivers in the cab. It sounds (description of features etc) and looks fabulous.

https://train-simulator.com/apt-p-detail/

As an aside, regarding the trackside transponders for speed, depending how these work and if they're scenario specific, if we understand how they work might we be able to use them as a way of fudging limits for rolling stock below normal linespeed for use in scenarios I wonder??

Deffo my favourite shot, cracking detail in there.

The attachment APT_0009.jpg is no longer available

Whoa. Impressive!

johnrossetti wrote:There is a fund raising effort to get the powercar from Coventry to Crewe as they only have one, I think they have raised enough to do it now
https://www.crowdfunder.co.uk/apt

I suspect a paint job will be next !
http://hampo.uk/2017/10/sent-to-coventry/

John

fudginator1 wrote:Obviously there was a few problems with the APT technically, with it possibly being put into service too quickly.
The thing for me which I can't quite grasp is there was loads of talk back then about passenger sickness, so what doesn't the 390's do the the APT did?

fudginator1 wrote:The thing for me which I can't quite grasp is there was loads of talk back then about passenger sickness, so what doesn't the 390's do the the APT did?

Tilting trains are meant to help reduce the effects of centrifugal force on the human body, but they can still cause nausea, a problem that was widely seen on early "active" tilting trains that exactly balanced the outward force. The effect could be felt under maximum speed and tilt, when the combination of tilting outside view and lack of corresponding sideways force can be disconcerting to passengers, like that of a "thrill ride". Researchers have found that if the tilting motion is reduced to compensate for 80% or less of lateral apparent force, then passengers feel more secure. Also, motion sickness on tilting trains can be essentially eliminated by adjusting the timing of when the cars tilt as they enter and leave the curves. Systems typically tilt the cars based on a sensor at the front of the train, and the slight delay in reacting to this information leads to a short period of sideways force while the cars react. It was found that when the cars tilt just at the beginning of the curves instead of while they are making the turns, there was no motion sickness. To provide information about the upcoming curves before the front of the train reaches them, a GPS system is used.[4]

fudginator1 wrote:Obviously there was a few problems with the APT technically, with it possibly being put into service too quickly.
The thing for me which I can't quite grasp is there was loads of talk back then about passenger sickness, so what doesn't the 390's do the the APT did?

fudginator1 wrote:he thing for me which I can't quite grasp is there was loads of talk back then about passenger sickness, so what doesn't the 390's do the the APT did?

david1 wrote:

fudginator1 wrote:he thing for me which I can't quite grasp is there was loads of talk back then about passenger sickness, so what doesn't the 390's do the the APT did?

The APT tilt system compensated for 100% of the curvature, where`s the class 390`s and other tilting trains only compensate for around 85-90% of the curve, because of the full compensation that why some passengers felt travel sickness, and in the Pendolino`s you still feel a small amount of sideways force while taking the curves.