The YC1 series (YC1系) is a hybrid diesel-electric multiple unit (DMU) train type operated by Kyushu Railway Company in Japan since 14 March 2020. One two-car train was delivered in June 2018 for testing in preparation for full production and entry into revenue service.

A hybrid train is a locomotive, railcar or train that uses an onboard rechargeable energy storage system (RESS), placed between the power source and the traction transmission system connected to the wheels. Since most diesel locomotives are diesel-electric, they have all the components of a series hybrid transmission except the storage battery, making this a relatively simple prospect.