Difference increases as investors price in slow growth, Europes debt crisis.

High-yield sales head for slowest month since December 2008.

High-yield sales head for slowest month since December 2008.

Watjen says returns on high-yield not equal to risk; buys utility debt instead.

Watjen says returns on high-yield not equal to risk; buys utility debt instead.

Offering gives the company $4.4 bln equity cushion.

Offering gives the company $4.4 bln equity cushion.

Railroad's issue follows similar deal from MIT