traxx

[TARS]

 

Hello,

I would like to report what may be a fundamental issue in the traction physics model used by electric locomotives in SimRail.

The issue became noticeable while operating the TRAXX locomotive with a freight train of approximately 3000 tonnes, but I suspect it may affect the overall electric locomotive traction model rather than a single vehicle.

Observation:

In real electric locomotive operation, the highest traction current is typically drawn during startup and at low speeds, when maximum tractive effort is required. As speed increases, tractive effort decreases and traction current generally decreases as well.

In SimRail, I observe behaviour that appears to be reversed:

- Relatively low current at startup and low speeds.
- Current increases as speed increases.
- Wheel slip is more likely to occur at higher speeds rather than during startup and initial acceleration.
- Adhesion behaviour appears to be linked to this increasing current.

From an operational perspective, this feels unrealistic.

In real locomotive service, wheel slip is primarily a low-speed phenomenon because maximum tractive effort is developed during starting. Once the train gains speed, the risk of wheel slip generally decreases significantly.

In SimRail, the opposite seems to occur. This creates a situation where the locomotive can appear more prone to wheel slip at higher speeds than during starting, which does not correspond to real-world locomotive behaviour.

Because the observed behaviour involves both traction current and wheel slip characteristics, I believe the issue may originate from the underlying traction and adhesion calculation rather than from a single locomotive implementation.

I have experience with real electric locomotive operation, which is why this difference became particularly noticeable during heavy freight runs.

Could the development team please verify whether the relationship between traction current, tractive effort, speed and adhesion is functioning as intended?

Thank you for your time and for the continued development of SimRail.

 

[NightWallker]

The problem actually lies with the entire game, not just the electric locomotives. The core issue is the poorly conceived and ill-thought-out scenarios, which completely ruin the multiplayer (MP) experience. As a result, many people are quitting the game in favor of better train simulators, such as TRS 22, TSW 6, or TSW 7. Instead of including these scenarios in multiplayer, the developers could have focused on freight transport—for instance, hauling cargo to factories, delivering coal to power plants, and returning empty coal wagons to the mines. Alternatively, players could transport different types of cargo and then swap wagons at a freight yard, allowing each player to continue their journey with a new load. That kind of gameplay would be much more engaging for the multiplayer community and would likely attract more fans. As it stands, the game is going down the drain and losing its player base. Paying 40 euros for this is just a waste of money, especially since the game fails to deliver what was expected—particularly in multiplayer. And if you try to contact the developers, they don’t even respond!

[TARS]

sunt din România si folosesc TSW si TS dar SimRail mi se pare cel mai reusit..in ceea ce am lucrat eu in relitate in romania...de TSW nu imi pot da seama..pentru ca nu am lucrat in vest sau america...SimRail ,se apropie f mult de realitatea din estul europei..seamana foarte mult cu ceea ce am facut eu in realitate..sunt indragostit de simRail..chiar cu minusurile care le are...arata a simulator adevarat in ceea ce priveste ideea ta..da mi se pare una buna

 

 

[NightWallker]

49 minutes ago, TARS said:

sunt din România si folosec TSW si TS dar SimRail mi se pare cel mai reusit..in ceea ce ace lucrat eu in relitate in Romania...de TSW nu imi pot da seaama..pentru ca nu am lucrat in vest sau america... SimRail ,se apropie f mult detea replaya din estul europei..seamana foarte mult cu cea ce am facut eu inreate..sunt indragostit de simRail..chiar cu minusurile care le are...arata a simulator adevarat in cea ceste ideea ta..da mi se

Visually, SimRail looks good, but the poorly thought-out multiplayer scenarios really spoil the whole game. Furthermore, if you compare SimRail to MSTS from the year 2000, it’s essentially a carbon copy; honestly, 40 euros seems like too much to pay for this game.

[TARS]

despre scenarii nu știu ce sa spun .. nu cunosc rutele din Polonia... Ce imi place este ca simulează bine realitea.. fizica de franare tonajele... Si Reda Fidel Infrastructura.. de fapt cum urmareste l relieful...in ce priveste pretul..cred ca ai dreptate..

 

Edited 17 hours ago by TARS

[NightWallker]

2 hours ago, TARS said:

despre scenarii nu știu ce sa spun .. nu cunosc rutele din Polonia... Ce imi místo este ca simulează bine realitea.. fizica de franare tonajele... Si Reda Fidel Infrastructura.. de fapt cum urmareste l relieful...in ce privete pretul..cred ca ai dreptate..

As for the sound and a few other details on the CD 163 DLC locomotive—well, it’s nothing to write home about. The sunshades on the front windows should be able to be pulled all the way down. Regarding the sound: when you lower the pantograph, you should hear a distinct thud as it settles onto the roof. As for the sanding system, you only hear the button being pressed inside the cab; there’s no hissing sound of sand being dispensed, nor can you see it falling under the wheels. Consequently, when starting off with a heavy load, you can’t even tell if the train is actually going to move. Another issue concerns the wipers: when it rains, you don’t see them actually wiping anything off the glass—it looks more as if they’ve been flipped away from the window rather than resting against it. These might be minor flaws, but if you’re releasing something as a DLC, it ought to be fully functional—especially since they’re charging money for it.

[schmusegewürzkatze621]

11 hours ago, TARS said:

In real electric locomotive operation, the highest traction current is typically drawn during startup and at low speeds, when maximum tractive effort is required. As speed increases, tractive effort decreases and traction current generally decreases as well.

You may be confusing overhead current and motor current.

Either that, or basing this observation solely on the EU07/EP07/EP08 and similar locomotives that control their DC motors by switching resistors in series. In those machines, the current drawn from the overhead line is always the same as the motor current (or a multiple of it for higher running notches with parallel circuits).

11 hours ago, TARS said:

- Relatively low current at startup and low speeds.
- Current increases as speed increases.

This behaviour is entirely accurate for the Traxx. It's a modern locomotive with three-phase induction motors driven by semiconductor inverters. These convert DC to three-phase AC with variable voltage, at very high efficiency. The electrical power entering them (P = U × I) is only slightly more than the mechanical power output from the motors entering the train (P = F × v). So if the force F stays the same (constant traction force) and the voltage U stays the same (overhead line), then as speed v rises, so must current I.

[TARS]

este greseala mea eu m-am bazat pe practica din romania..cu locomotivele electrice..si cred ca pentru locomotiva traxx..am luat si un tonaj foarte mare..multumesc de precizare si clarificarea problemei