Working real hard

I was watching with interest the commercial vessels at work on the Danube River, the Devin Castle provided an ideal vantage point to see the workboat working at full throttle to push the barge against the insanely strong current. The two vessels were hardly moving forward, I was listening to the exhaust note of the diesel engines and watching the wake from the bow. The appearance of moving rapidly through the water is created by the current rushing past, taking a good look at the stern wake, full throttle for minimal movement.