Enginespecs

[ady86245]

Hi,

I've been looking at the performance of some of my locomotives, and noticed some weird behaviour with some of them in Driver mode.
So I decided to create a simple test track - a flat, straight, 15 baseboard single track roughly 6.5 miles long with a 100mph speed limit and plenty of "green" signals, and an AI driver instructed to drive to a trackmark at the far end.

A class 47 Diesel locomotive hauling a test train of 8x Mk2f carriages (a typical prototypical load) on this test track hits 100mph after roughly 7 baseboards (3 miles) - which (if memory serves me correctly) seems about right.
Meanwhile one of Strings' class 86 electric locomotives hauling the same load struggles to even reach 85mph before running out of track and having to slow down - as an avid Class 86 fan in my youth I know that this is not right...

Meanwhile a class 315(?) Multiple Unit I downloaded seemed to have an acceleration and braking performance that would put a Formula one car to shame! :hehe:

Have Auran changed the physics engine at any point which would cause these anomalies? And does anybody have any advice on how to interpret/debug enginespecs or tweak them?

Thanks in advance.
Kate

 

[Bill69]

Hi ady86245,

I am not sure about diesels but they have changed the physics of steam engines. A steam engine that was made for TRS2009 to TS12 is now likely to run out of steam pressure anywhere between 5 and 10 miles with a load. The physics of a steam engine have been changed to avoid the safety valves blowing off at frequent intervals but it has caused major problems trying to keep up boiler pressure, so much so that new engine specs are required for T;ANE However there are always variations in even two of the same locos depending on who made the e-specs. The e-specs are not an exact science, they require quite a lot of calculations and lots of testing and tweeking to get the loco running as you want it to.

Cheers,
Bill69

 

[Azervich]

Diesel locomotives are user created by setting Tractive Effort (T.E) to velocity, some people fudge these values by having higher T.E. to give quicker acceleration however it does make it over powered, trainz reads T.E in kilonewtons (kn) in the config and the values on left is speed in metres per second (velocity) 27.7 m/s = 100km/h | 62mph for example, values on right are T.E, I've seen some physics that have 400kn (90,000lbf) at 60 km/h, so that's pretty much how it works in trainz as people write them up to how they want it to perform, I aim for real world physics, if I have no data I use what the velocity the locomotive does with a specific tonnage on a grade, so it'll vary due to this very reason.

Also, as T.E. is in kn the values look very low to some people that don't have an understanding the conversion from pounds force so they up the values very high.

Cheers.