QUESTION: Realism... Speed around curves and not derailing.

[jcardana]

QUESTION [SOLVED]: Realism... Speed around curves and not derailing.

Hi Fellow Trainzienz,

BACKGROUND:
I just got TRS2019 after 7 years with TRS12. I developed a little program that calculates speed limits around curves. With TRS2019, I'm updating my formula.

I made a test track starting with 1000m radius curves and going down to 100m in 100m increments.

While traveling 60mph, I'm able to negotiate ALL curves. It's not until the 300m curve that I get "Rough Handling". On the 200m curve, I get "Rough Handling" and "Excessive Curve Speed". On the 100m curve, I only get "Excessive Curve Speed". While Derailment is set to realistic, the train never derails. It seems a 10/1 ratio works. Meaning at 60mph, a 600m radius curve would be the minimum. But that still seems a bit sharp.

QUESTION:
What speed/curve formula are the developers using to determine if a train derails?

ALT QUESTIONS:
What actions prompt a "Rough Handling" notification? I have a train with 2 locos, 5 flatcars w/Trailers and 5 boxcars with Tissue and a caboose. I nudge the throttle in position 1 and get "Rough Handling".

Am I missing a Rule or Setting that adjusts "Realism"?

Thank you for your time,
Joe

 

[whitepass]

TRS19 dose not have derailment, the old code would not work and new code is on the to do list.

 

[JCitron]

I've noticed that the "Excessive curve speed" message occurs on entrance and exit from the curve its self when coming off a straight away. If the curve is eased, no matter what speed, this message is non-existent. I've seen this as low as 15 mph on my trolley route where sharp curves are a necessity.

 

[jcardana]

TRS19 dose not have derailment, the old code would not work and new code is on the to do list.

Thanks! That's saving me a lot of frustration. I love forums!

So I've simplified my formula. Does a Max speed of 60mph around a 1000 meter curve sound about right? I'm not finding much in the way of resources online.

 

[jcardana]

It's working

 

[jcardana]

I've noticed that the "Excessive curve speed" message occurs on entrance and exit from the curve its self when coming off a straight away. If the curve is eased, no matter what speed, this message is non-existent. I've seen this as low as 15 mph on my trolley route where sharp curves are a necessity.

I saw something about that on a wiki page, going to experiment with easements. Thanks!

 

[TSwenson]

One element that actual railroads have over the sim is super-elevation, and raising the outer rail in a curve can change things greatly. It seems to me that the sim assumes that we have optimum super-elevation for all our curves. I'd presume that USDOT/FRA has information on super elevation available, somewhere. I would start looking under track maintenance/construction standards, and I bet a good understanding of engineering is probably very helpful in understanding it all.

 

[pware]

It seems to me that the sim assumes that we have optimum super-elevation for all our curves.

No, super-elevation has to be manually added after the track has been laid - see the Trainz Wiki page at https://online.ts2009.com/mediaWiki/index.php/Superelevation but not all curves in the real world use super-elevation.

 

[TSwenson]

No, super-elevation has to be manually added after the track has been laid - see the Trainz Wiki page at https://online.ts2009.com/mediaWiki/index.php/Superelevation but not all curves in the real world use super-elevation.

Sorry, I should have specified that the calculations seem to use it... not that it was in the track spline with out effort. Just as it seems that "track condition" doesn't effect derailment, as I've put in some "bad" track simulating an overused undermaintained yard and based on my experience at a similar facility there should have been a few so far.