Caltrain's first fatality of 2020 happened about 9:38 a.m. There were no injuries to any of the 64 passengers aboard the train.
Emergency personnel are at the scene and trains are stopped in the incident area, the agency said.
Northbound trains resumed operation about 10:18 a.m.
Customers should expect delays of up to 60 minutes, according to Caltrain, which said it will post delay information via Twitter on its caltrain account.