To construct a sustainable railroad maintenance system, one of the important issues is the sharing and passing on of equipment maintenance knowledge (tacit knowledge) associated with individual engineers. In this study, we attempted to formalize the tacit knowledge of engineers involved in periodic inspections of electric point machines based on questionnaire surveys of engineers. As a result, when inspecting lock, it was found that while many engineers adjust with a 3:7 ratio, some engineers adjust with a 4:6 ratio, and that engineers who adjust with a 3:7 ratio tend to leave a misalignment amount, considering temperature changes, irregularities, and rattles. The percentage of engineers who leave a misalignment amount showed no correlation with age, suggesting that tacit knowledge may not be sufficiently handed down and shared through field experience and OJT alone.