Compare this concept drawing with photos of the eventual product. Note the 4-position headlight switches (Off, Low, Med, High). This idea resulted from a union request. Most of the railroad had a well-built and maintained gravel-surfaced access road running immediately parallel and it was used by public as well as company traffic. Since much of the railroad was along long tangent sections, locomotive drivers were obliged to dim their headlights at night for extended distances so as not to blind on-coming drivers. The ‘Medium’ position was a practical solution that helped both parties.