The problem this morning was that many passengers weren't paying attention to the news, Johnson said.
"They were like most of us, enjoying life on Sunday and they got to the station this morning and realized something had changed," he said.
But as the morning wore on nearly everybody got the news, he said.
Johnson said there were three fires Saturday in equipment at the Hayward yard as BART technicians were performing upgrades. "One fire triggered another at a substation. Then later in the day another fire at another substation broke out," he said.
As a result, for the next six to eight weeks, only the San Francisco-Fremont line will stop at the Hayward, South Hayward, Union City and Fremont stations. Trains on the Richmond-Fremont line will stop short of the four stations and turn around at Bay Fair.
During the hours when the San Francisco-Fremont train is not scheduled to operate, Richmond to Fremont trains will go all the way to Fremont.
Trains operating in the affected area will operate at 15-minute intervals and will be eight to 10 cars long. In addition, the trains will be running at half their normal speed between Fremont and Bay Fair stations because the fire created train control problems in that area.
The fires were the worst on the BART system since the 1979 fire in the transbay tube, BART spokesman Linton Johnson said.
Exact details and damage estimates have not been released.