RSA 243:57: Lights on Railroad Track Motor Cars.

Every person, firm or corporation operating or controlling any railroad running through or within the state shall equip each of its track motor cars or similar vehicles used during the period from 30 minutes before sunset to 30 minutes after sunrise with an electric headlight of such construction and with sufficient candlepower to render plainly visible at a distance of not less than 300 feet in advance of such track motor car any track obstruction, landmark, warning sign or grade crossing, and further shall equip such track motor car with a red rear electric light of such construction and with sufficient candlepower as to be plainly visible at a distance of 300 feet.