Relating CME

At RollingStockEntity class:
    @Override
    public void onEntityUpdate(){
        super.onEntityUpdate();
        if(this.ticksExisted == 5){
            RoW.proxy.playSoundRoll(this);
            RoW.proxy.playSoundSkirr(this);
        }
        <..>
    }

ProxyCommon has empty methods, while ProxyClient has next:
    @Override
    public void playSoundRoll(RoWRollingStock stock){
        FMLClientHandler.instance().getClient().getSoundHandler().playSound(new SoundStockRoll(stock));
    }

    @Override
    public void playSoundSkirr(RoWRollingStock stock){
        FMLClientHandler.instance().getClient().getSoundHandler().playSound(new SoundStockSkirr(stock));
    }