Greyhound agreed to buy GM’s bus-making units.

General Motors manufactures the RTS transit bus in Pontiac, Mich., and the Classic in St. Eustache, Canada, Phoenix-based Greyhound Corp. said. John W. Teets, Greyhound chairman and chief executive, said the acquisition of GM’s transit bus facilities represent an “excellent fit” with Greyhound’s current bus-building operations. Terms of the deal were not disclosed.