Saint Louis Lines is an operating HO-scale model railroad. It is a hybrid blend of prototypical and fictional railroading in the Saint Louis metropolitan area during the late nineteen-seventies.

Protolancing is an approach to model railroading that meshes “prototype” and “freelance” modeling. Selective modifications have been introduced to satisfy personal preferences, improve operations, and accommodate logistical constraints. The goal is to create a balanced experience for operators who can appreciate both accuracy and creative expression.