while(True):

    # starting clock to calculate delta
    start_time = time.time()


    # getting the tractive effort
    te = mod.GetTractiveEffortFirstVariant(train, train.speedkmH, 2.5)
    # getting the rolling resistance
    rr = mod.CalculateDavisFormula1970(train, hp.KMH_TO_MPH(train.speedkmH))

    # get the difference
    diff = te - rr

    # getting the acceleration in m/s
    acc = diff/train.GetTotalWeightTrain()

    # getting the delta time
    delta = time.time() - start_time

    # store the speed in mps
    train.speedMpS = train.speedMpS + acc * delta
    # convert it to kmh
    train.speedkmH = hp.MS_TO_KMH(train.speedMpS)