Xbox Freight Wagons Too Heavy?

I was just about to do Northern Trans Pennine Service NH10 7:35 am. (German Name: Güterwaggons nach Leeds) I tried all three locomotives. None of the three managed to move the Wagons. Usually I have no problem driving these three locomotives, but here the Train hasn't moved a meter, the wheels just spun.

Edit: Weather: Spring, cloudy

 

Set the brake to "Vaccum - Goods" (don't know what it's called in German though). You can find the switch on the back wall in the cab.

 

It worked. Thank you.