"Motor" container

The Motor container is a top-level config.txt file entry used by Enginespec and Steam Enginespec assets.

Supported Tags

The Motor container supports the following tags. Each tag is show here with its default value.

motor
{
    resistance 1.7
    adhesion 5.0
    maxvoltage 600.0
    maxspeed 33.3
    brakeratio 55000
    max-accel 3500
    max-decel 9000
    throttle-notches 8
    axle-count 6
    surface-area 80.0
    moving-friction-coefficient 0.03
    air-drag-coefficient 0.00017
    full-throttle-speed 33.0*
    driving-wheel-weight-ratio 1.0
}

• Omit/delete as an illegal value in TRS2006∅

resistance

Type: Decimal

Desc: Not used

adhesion

Type: Decimal

Desc: Not used

maxvoltage

Type: Decimal

Desc: Voltage to traction motors. This is used to scale the ammeter displayed in the cab. (Power is volts times amps - increasing the voltage means reducing the ammeter...)

maxspeed

Type: Decimal

Desc: Maximum speed in DCC mode.

brakeratio

Type: Decimal

Desc: Coefficient between the pressure in brake cylinder and the brake force.

max-accel

Type: Decimal

Desc: Accelerative force available in DCC mode. Note - this is a force, not a rate of acceleration. The rate of acceleration will depend on the mass of the train as well.

max-decel

Type: Decimal

Desc: Decelerative force available in DCC mode. Note - this is a force, not a rate of deceleration. The rate of deceleration will depend on the mass of the train as well.

throttle-notches

Type: Integer

Desc: Number of throttle notches

axle-count

Type: Integer

Desc: Number of axles on this vehicle. Used in rolling resistance calculations.

surface-area

Type: Decimal

Desc: frontal surface area (sq ft) of vehicle. Used in air resistance calculations.

moving-friction-coefficient

Type: Decimal

Desc: Used in rolling resistance calculations.

air-drag-coefficient

Type: Decimal

Desc: Used in air resistance calculations.

full-throttle-speed

Type: Decimal

Desc:

Notes: TRS2006-SP0 reports this tag as an error in a "container-type 'motor'"

driving-wheel-weight-ratio

Type: Decimal

Desc: Ratio (between 0.0 and 1.0) of the weight of this vehicle bearing down on driven wheels. Used by steam locos only.

Example motor container

TBD

Resistance calculations

These calculations occur according to Davis formula:

R = (1.3ˑm + 29ˑaxle-count) + moving-friction-coefficientˑmˑV + air-drag-coefficientˑsurface-areaˑV^2 + 20ˑmˑG

R = total resistance in lb. including grade resistance
V = speed - mph
m = weight of the vehicle (tons)
G = % grade (upgrade +, downgrade -)