Grain growers from Texas to North Dakota were beaming over the tall chaffs of a bumper crop, ready to harvest and send it to market. But their happiness turned to outrage when they found out the wheat wouldn't be going to the market. "A year ago the shippers couldn't get rail cars, so grain stayed on the ground and in grain elevators," said Jack Eberspacher, chief executive of the National Association of Wheat Growers. The growers have little choice of rail carriers for their crops, he said. "To be honest with you we haven't heard complaints about U.P. like we did a year ago after the Southern Pacific merger. That's good news because we're basically down to two choices, Burlington Northern ( BNI ) or Union Pacific."