I'm on the call board in feeders, was told to come in at 11:45pm to work as directed. I went in, got a tractor, did the pre trip. Ivis has no legs scheduled so I ask dispatch what they want me to do. They told me they didn't have anything right this second, to wait in the tractor and they would send me something when it came up. It's almost 6:30am and I'm still sitting in my tractor waiting. There are actually 4 of us sitting here on the yard waiting. I've done this several times too. I've waited on a door for 5 hours just for them to tell me nevermind. I've also been sent to the rail yard to bring a trailer back and the train was delayed. Waited 3 hours and then as the crane moved away from my trailer another driver backs under it. I called tofc and someone gave us both the same trailer by mistake. Told to bobtail back.. Working as directed sure is easy money. They just handing cash out.