Mo. Rev. Stat. § 389.800: Contributory negligence not to relieve from liability.

When any employee or other person shall be injured, maimed or killed, by reason of the noncompliance with the provisions of section 389.790, then in any action for damages which may be instituted against any railroad company, corporation or lessee for such injuring, maiming or killing, proof of contributory negligence or carelessness on the part of any employee or other person so injured, maimed or killed, shall not relieve such railroad company, corporation or lessee from liability.