From 1915 his post was renamed that of the ' Chief Mechanical Engineer ' .
Other innovations during Churchward 's office included the introduction of self - propelled Steam Rail Motors for suburban and light branch line passenger trains .
From 1915 Churchward 's post was renamed that of the ' Chief Mechanical Engineer ' .
Other innovations during Churchward 's office included the introduction of self - propelled Steam Rail Motors for suburban and light branch line passenger trains .