<page_title> British Rail Class 507 </page_title> <section_title> Fleet details </section_title> <table> <cell> Class 507 <col_header> Class </col_header> </cell> <cell> 3 <col_header> Cars per Set </col_header> </cell> <cell> 507001–507021, 507023–507033 <col_header> Unit nos. </col_header> </cell> </table>
507s are formed of three cars, and numbered 507001 to 507033.