Union Pacific is adding more jobs in Omaha.

The company said that more than 180 employees have decided to leave the company to remain in St. Louis as Union Pacific shifts jobs to its new headquarters in Omaha. That means about 180 information technology, accounting and customer service jobs will be available in Omaha.

Meanwhile, Union Pacific is declining some business as it struggles with a train crew shortage. For one month beginning Monday, United Parcel Service will put packages on trucks that normally would run express rail routes once a week each way from Los Angeles to New York, Dallas and Memphis.

UPS spokesman Norman Black said Union Pacific explained that it was having some congestion problems it wants to get a handle on quickly.

Union Pacific's Kathryn Blackwell said the railroad has heard complaints from some customers about slower service. She said it began hiring train crews at an accelerated rate late last summer to get the railroad back up to speed.

Blackwell said the nation's economy has rebounded more quickly and with more strength than Union Pacific and its customers had anticipated. In addition, more engineers and conductors have retired than had been expected under new federal rules that allow them to leave at age 60 with 30 years of service.

Blackwell said the railroad expects to hire 4,000 train crew workers through this year, with about half in new positions and half covering normal attrition. The railroad employs about 20,000 engineers and conductors.