Alco RS-3 Physics

**R. Steele** · 04-17-2023, 17:50

Engine Section of the file, had to be cut in half due to size limits in posts

Code:

Engine ( SCO_RS3

Comment ( ********* Engine Exhaust Effects --- Size and Position of Emitted Particles ********* )

	Effects (
		DieselSpecialEffects (
			Exhaust1 (
			0.03 5.085 3.18
			0 1 0
			0.22
			)
			Exhaust2 (
			0.03 5.085 3.18
			0 1 0
			0.25
			)
			Exhaust3 (
			0.03 5.085 3.18
			0 1 0
			0.27
			)
			Exhaust4 (
			0.03 5.085 3.18
			0 1 0
			0.31
			)
		)
	)
	
Comment ( ********* General Information ********* )

	Wagon ( SCO_RS3 )
	Type ( Diesel )
	ORTSDriveWheelWeight ( 112.8991t )  Comment ( Weight on all drive wheels )
	ORTSNumberDriveAxles ( 4 )
	MaxCurrent ( 1500A )
	Sanding ( 15mph )
	CabView ( RS3Cab.cvf )
	HeadOut ( 1.682 3.23 -3.323 )
	MaxDieselLevel ( 800gal )
	DoesHornTriggerBell ( 0 )
	
Comment ( ********* Diesel Prime Mover Information ********* )
Comment ( With the exception of those labeled optional all parameters must be present for engine to operate )

ORTSDieselEngines ( 1			
	Diesel (		
	IdleRPM ( 350 )		
	MaxRPM ( 1000 )		
	StartingRPM ( 250 )		
	StartingConfirmRPM ( 400 )		
	ChangeUpRPMps ( 82 )		
	ChangeDownRPMps ( 52 )		
	RateOfChangeUpRPMpSS ( 12 )		
	RateOfChangeDownRPMpSS ( 8 )		
	MaximalPower ( 1312432W )		
	IdleExhaust ( 1.2 )		
	MaxExhaust ( 2.2 )		
	ExhaustDynamics ( 1.6 )		
	ExhaustDynamicsDown ( 0.8 )  Comment ( This parameter is optional )
	ExhaustColor ( 20161819 )		
	ExhaustTransientColor ( 40212324 )		
	DieselPowerTab (		
		0	0
		432	164054
		514	328108
		596	492162
		678	656216
		760	820270
		842	984324
		924	1148378
		1000	1312432
	)		
	DieselConsumptionTab (		
		0	0
		350	37.9
		1000	227.1
	)		
	ThrottleRPMTab (		
		0	350
		12.5	432
		25	514
		37.5	596
		50	678
		62.5	760
		75	842
		87.5	924
		100	1000
	)		
	DieselTorqueTab (		
		0	0
		432	29010
		514	24382
		596	21027
		678	18484
		760	16490
		842	14884
		924	13563
		1000	12532
	)		
	MinOilPressure ( 25psi )		
	MaxOilPressure ( 70psi )		
	MaxTemperature ( 120degc )		
	Cooling ( 3 )		
	TempTimeConstant ( 720 )		
	OptTemperature ( 71degc )		
	IdleTemperature ( 55degc )		
	)		
)

Comment ( ********* Open Rails Tractive Force Curves ********* )

	MaxForce ( 276893N )
	MaxContinuousForce ( 233532N )
	ORTSSpeedOfMaxContinuousForce ( 9.52mph )
	ORTSMaxTractiveForceCurves (
		0 (			
			0	0	
			3.59	0	
			6.04	0	
			9.61	0	
			13.19	0	
			16.99	0	
			20.56	0	
			24.14	0	
			28.61	0	
			33.98	0
			38.45	0	)
	0.125 (				
			0	34612	
			3.59	34612	
			6.04	20590	
			9.61	12928	
			13.19	9423	
			16.99	7315	
			20.56	6043	
			24.14	5148	
			28.61	4343	
			33.98	3658	
			38.45	3232	)
	0.25 (				
			0	69224	
			3.59	69224	
			6.04	41179	
			9.61	25856	
			13.19	18845	
			16.99	14630	
			20.56	12085	
			24.14	10295	
			28.61	8686	
			33.98	7315	
			38.45	6464	)
	0.375 (				
			0	103835	
			3.59	103835	
			6.04	61768	
			9.61	38784	
			13.19	28267	
			16.99	21944	
			20.56	18128	
			24.14	15442	
			28.61	13029	
			33.98	10972	
			38.45	9696	)
	0.50 (				
			0	138447	
			3.59	138447	
			6.04	82357	
			9.61	51712	
			13.19	37689	
			16.99	29259	
			20.56	24170	
			24.14	20590	
			28.61	17372	
			33.98	14630	
			38.45	12928	)
	0.625 (				
			0	173058	
			3.59	173058	
			6.04	102946	
			9.61	64640	
			13.19	47111	
			16.99	36573	
			20.56	30213	
			24.14	25737	
			28.61	21715	
			33.98	18287	
			38.45	16160	)
	0.75 (				
			0	207670	
			3.59	207670	
			6.04	123535	
			9.61	77568	
			13.19	56533	
			16.99	43888	
			20.56	36255	
			24.14	30884	
			28.61	26058	
			33.98	21944	
			38.45	19392	)
	0.875 (				
			0	242282	
			3.59	242282	
			6.04	144124	
			9.61	90496	
			13.19	65955	
			16.99	51202	
			20.56	42298	
			24.14	36031	
			28.61	30401	
			33.98	25601	
			38.45	22624	)
	1.0 (				
			0	276893	
			3.59	276893	
			6.04	164713	
			9.61	103424	
			13.19	75377	
			16.99	58517	
			20.56	48340	
			24.14	41179	
			28.61	34744	
			33.98	29259	
			38.45	25856	)
		)			

Comment ( ********* Emergency and Wheelslip Throttle Information ********* )

	ORTSEmergencyCausesThrottleDown ( 0 )
	ORTSWheelSlipCausesThrottleDown ( 0 )

Comment ( ********* Brake System ********* )

	BrakesEngineBrakeType( "Air_single_pipe"  )
	BrakesTrainBrakeType( "Air_single_pipe" )
	ORTSMainResChargingRate ( 0.4psi/s )
	ORTSBrakePipeChargingRate ( 200psi/s )
	ORTSEngineBrakeReleaseRate ( 38psi/s )
	ORTSEngineBrakeApplicationRate ( 34psi/s )
	ORTSBrakePipeTimeFactor ( 0.003 )
	ORTSBrakeEmergencyTimeFactor ( 0.1 )
	ORTSBrakeServiceTimeFactor ( 1.009 )
	ORTSAirBrakeMainresvolume ( 28.35ft^3 )
	TrainPipeLeakRate ( 0.0833psi/s )
	TrainBrakesControllerMaxReleaseRate ( 10psi/s )


	AirBrakesAirCompressorPowerRating( 1.2 )        ARE THESE PARAMETERS NEEDED? From here to end of section - TrainBrakesController?
	AirBrakesMainMinResAirPressure( 15 )
	AirBrakesMainMaxAirPressure( 140 )
	AirBrakesMainResVolume( 8 )
	AirBrakesAirCompressorWattage( 10kw )
	AirBrakesCompressorRestartPressure( 130 )
	AirBrakesAirUsedPerPoundsOfBrakePipePressure( 0.22 )
	AirBrakesIsCompressorElectricOrMechanical( 1 )

	EngineBrakesControllerMinPressureReduction( 6 )
	TrainBrakesControllerMinPressureReduction( 6 )
	EngineBrakesControllerHasProportionalBrake( 1 )
	EngineBrakesProportionalBrakeLag( 0.9 )
	EngineBrakesControllerMaxApplicationRate( 20 )
	TrainBrakesControllerMaxApplicationRate( 20 )
	EngineBrakesControllerMaxReleaseRate( 15 )
	TrainBrakesControllerMaxReleaseRate( 4 )
	EngineBrakesControllerEmergencyApplicationRate( 50 )
	TrainBrakesControllerEmergencyApplicationRate( 50 )
	EngineBrakesControllerMinSystemPressure( 0 )
	TrainBrakesControllerMinSystemPressure( 0 )
	EngineBrakesControllerMaxSystemPressure( 90 )
	TrainBrakesControllerMaxSystemPressure( 90 )
	EngineBrakesControllerEmergencyBrakeTimePenalty( 60 )
	TrainBrakesControllerEmergencyBrakeTimePenalty( 60 )
	EngineBrakesControllerFullServicePressureDrop( 26 )
	TrainBrakesControllerFullServicePressureDrop( 26 )

Comment ( ********* Engine Controllers and Controller Information ********* )

	BrakesEngineControllers( "Independent, Train," )
	EngineBrakesControllerDirectControlExponent( 1 )

EngineControllers (
        Throttle ( 0 1 0.125 0 
                NumNotches ( 9
                    Notch ( 0       0 Dummy )
                    Notch ( 0.125   0 Dummy )
                    Notch ( 0.25    0 Dummy )
                    Notch ( 0.375   0 Dummy )
                    Notch ( 0.5     0 Dummy )
                    Notch ( 0.625   0 Dummy )
                    Notch ( 0.75    0 Dummy )
                    Notch ( 0.875   0 Dummy )
                    Notch ( 1       0 Dummy )
                )
            )
            Brake_Engine ( 0 1 0.155 0 
                NumNotches ( 1
                    Notch( 0  1 Dummy )
                )
            )
            Brake_Train ( 0 1 0.045 0.25 
                NumNotches ( 5
                    Notch( 0    0 TrainBrakesControllerReleaseStart )
                    Notch( 0.3  1 TrainBrakesControllerGraduatedSelfLapLimitedHoldingStart )
                    Notch( 0.85 0 TrainBrakesControllerSuppressionStart )
                    Notch( 0.9  0 TrainBrakesControllerContinuousServiceStart )
                    Notch( 1.00 0 TrainBrakesControllerEmergencyStart )
                )
           
            )
            DirControl ( -1 0 1 1 )
            BellToggle( 0 1 0 )
            AWS ( 0 1 0 )
            Sanding ( 0 1 0 )
            Horn ( 0 1 0 )
            Wipers ( 0 1 0 )
            EmergencyStopResetToggle( 0 1 0 )
            EmergencyStopToggle( 0 1 0 )
            Vigilance ( 0 1 0 )
            Headlights ( 0 0.25 1 0 )
            BailOffButton( 0 1 0 )
            EngineVariables( 800 )
        )
        
Comment ( ********* Engine Description, Name and Reference Information ********* )

    	Sound (	"RS3cab.sms" )
    	Name ("SCO_RS3")
    	Description ( "The Alco RS3 was the 2nd model in a long Series of Road Switchers(RS)" )
    	Comment ( Ver3 Standard ORTS Diesel Engine for Alco RS3 )
    	Comment ( Alco Operating Manual TP401 for Model RS-3 1600-HP Road Switcher )
    	Comment ( Locomotive Cyclopedia of American Practice 1950-52 edition, Sec.1 pages 105-107 )
    	Comment ( NYC dimensions & classifications of Diesel-Electric Locomotives Book 387 pages 229 to 233A )
    	Comment ( NYC technical drawing for Class drs-6 and drs-6p -- Alco RS-3 )
    	Comment ( Gear Ratios -- Freight - 65:18 max speed 65mph Passenger - 74:18 max speed 75mph )
    	Comment ( Power Ratings == Gross HP 1760 == Traction HP 1600 == Rail HP 1360 )
    	Comment ( Power Ratings per New York Central technical specifications )
    	Comment ( Continuous Tractive Effort 52500lb @ 9.52mph==84.4%eff. == Starting Tractive Effort 62250lb )
    	Comment ( Efficiency - eff - refers to power loss from Input HP Traction Motors to Rail HP )
    	Comment ( Mass 248900lbs = 112.8991t == metric, Adhesion Factor = 25.01% )
    	Comment ( MassÃ—Adhesion Factor = Starting Tractive Effort )
    	Comment ( Brake HP -- bhp = Power-at-the-shaft = Gross HP or MaximalPower )
)

**jdonald1** · 04-21-2023, 09:24

Hi Gerry: I'm just wondering what the point is in making a full .eng file without any include files? That is a pretty big file and the lighting section isn't even included. IMHO a pure OR file using include files where appropriate is a much more efficent way to go.
Thanks
Don

**derekmorton** · 04-21-2023, 10:29

>is a much more efficient way to go

Depends how you define efficiency,
From a file system point of view, a single file is more efficient, one I/O to get all of your data.

Include files slow the loading as many file system requests have to be made.

**eric** · 04-21-2023, 11:19

I agree with Derek. I've never really been a fan of include files or aliases for sound and cab views. They are convenient in that you don't have to repeat the same code over and over and over again, but they're a pain to debug.

As a developer, they're a necessary evil for stuff that runs hundreds+ of times, but I'm not sold on it being more efficient for the game on just an instance loading.

Sent from my SM-G981U using Tapatalk

**rdayt** · 04-21-2023, 12:40

Agreed.
When I move a piece of equipment from one folder to another I don't want to have to hunt down a bunch of dependencies.
Drive space is cheap.

Randy

**R. Steele** · 04-21-2023, 15:22

Originally posted by jdonald1

Hi Gerry: I'm just wondering what the point is in making a full .eng file without any include files? That is a pretty big file and the lighting section isn't even included. IMHO a pure OR file using include files where appropriate is a much more efficent way to go.
Thanks
Don

There is an easy answer to that --- I was asked to make one. I also use include files, nothing as sophisticated as some setups I've seen --- just an OpenRails folder within the parent locomotive folder. The default MSTS locomotive file is unedited. I started doing it that way before I understood anything about the MSTS file and did not want to fool with it.

Also, I've had many emails and questions from users of my OR Std Eng files and they are flummoxed by include files and OpenRails folders. A single engine file makes more sense to them. OR is especially flexible in that regard, there's quite a few ways to use include files.

Lastly, I had never made this type of file and this task gave something new to work at, a challenge. Any advice?

( Ps -- this file could be shortened quite a bit, by using OR basic physics and default parameters. )

**bwbrgb** · 04-22-2023, 08:52

I also agree with full files for each engine sample for all the above mentioned reasons . I also have worked with many types of engines - large and small - and have yet to find any that respond the same . I think the full file gives you a chance to show deviations- eg. - tired and smokey , new with full power and clean etc.

**CSRX** · 04-22-2023, 15:54

Full files work best for me. Some reason only NAVS and some of TS files work fine with their include files. Everything else I have to rework to the old style set up for the stuff to even load in ORTS.

I have never had any luck with getting anything of my own to work properly in ORTS either with include files. I've asked a few times, and haven't received much help except the "It works for me" response. Oh well.
I have heard that it can be very finicky though when it comes to setting up the Include files, so obviously somewhere something isn't correct. Eh, Full engine and wagon files still work best for me.

**eric** · 04-22-2023, 17:31

Originally posted by R. Steele

There is an easy answer to that --- I was asked to make one.

That's a pretty good reason to do it.... having a solid example goes a long way to figuring out your own.

**R. Steele** · 04-29-2023, 20:08

An important note, all the ORTS physics parameters can be found on various pages at Peter Newell's ( OR Developer ) excellent web site -- look under physics >>>> https://www.coalstonewcastle.com.au/physics/

Must give credit to the OR Development team ( and of course Peter ) for all their volunteer work and effort on the sim. Thanks.