TOKYO (Reuters) - Japanese Prime Minister Shinzo Abe said on Monday the government will speed up construction of bullet trains and push forward by up to eight years the completion of maglev train networks as part of a stimulus package to support the economy.

Abe said he will instruct Economy Minister Nobuteru Ishihara on Tuesday to start work on compiling a fiscal stimulus package, but did not mention how much the size of spending will be.

Abe was speaking at a news conference after his ruling coalition won a landslide victory on Sunday in an upper house election.

(Reporting by Tetsushi Kajimoto, Stanley White and Leika Kihara; Editing by Chris Gallagher)