Amtrak Cascades

An Amtrak Cascades Talgo 8 train, shown on Jan. 30, 2014.

(Thomas Boyd/staff)

SEATTLE -- Passengers were delayed but no one was injured Sunday after the locomotive on an Amtrak train derailed.

that the locomotive on train 502 heading from Portland to Seattle with 235 passengers lost contact with the rails at about 12:05 p.m. Sunday.

It remained upright, and none of cars on the train came off the track.

Amtrak spokeswoman Chelsea Kopta says they loaded the passengers on to buses. The derailment caused delays on two later Amtrak trains as well.

Emergency officials say there was no visible damage to the cars on train 502, and no sign of fuel leaking.

The derailment disrupted traffic on the busiest rail line in the state, which was re-opened 5:10 p.m. Sunday.

Kopta says the cause is under investigation.

-- The Associated Press