The locomotives were used primarily on track maintenance trains, but following their withdrawal in 2014, only one locomotive, DeKi 303, remains in use, limited to depot shunting duties at Meitetsu's Maigi Maintenance Depot.

A sixth locomotive, Ki 15, was added to the fleet with the purchase of former Ichibata Electric Railway DeKi 1, built in 1923 by Mitsubishi.

[1] Originally painted in black, the locomotives were repainted into "Meitetsu Blue" when they underwent life extension refurbishment in 1993.

[1] DeKi 301 was scrapped following damage sustained in a level crossing accident in 1966.

[1] DeKi 302 was withdrawn in 1984, after becoming surplus to requirements due to the reduction in freight operations.