However, after World War II began it became difficult to acquire fuel for these buses, and the city tried to introduce charcoal-powered buses, electric-powered buses and coalite-powered buses, as well as tried to produce charcoal for the charcoal-powered buses by itself.
しかし、第二次世界大戦の勃発による影響で燃料の入手が次第に難しくなり、木炭自動車、電気自動車、コーライト自動車、メタンガス自動車の導入や、木炭自動車用の木炭の自家製化などを図ることとなった。