old rail road light model F transport product corp

you are buying an older 12 volt rail road light model F made by transport products corporation louisville ky. with 8'' red lens and 2 small 2'' clear lens they will show red if light is on.red lens is marked road 20 top and bottom. each side is marked 10-10.have no idea what they mean.hood cover 10'' long back shield is 20'' across.could be changed to electric. wt approximate 25 lb buyer pays postage. buying as is as seen