170.06 Boiler Inspection Act--Statutory Provisions At the time of the occurrence, there was in force a federal statute known as the Boiler Inspection Act. That Act imposed upon the railroad the absolute duty to have every locomotive used or permitted to be used on its line, together with [the [boiler] [tender]] all parts and appurtenances of any such locomotive, in a proper and safe condition for operation on the railroad without unnecessary danger to life or limb. The statute provides that railroads violating the Act are liable to persons covered under the Act for [injuries] [death] caused in whole or in part by such violations. The statute further provides that neither negligence on the part of the employee nor the absence of negligence on the part of the railroad is a defense to liability under this Act.