v1.6.0 vs v1.5.3
• Track grade markers — colored slope indicators (^/^^/^^^) placed every 50m along tracks, toggleable in settings
• ALT+hover tooltips — car/loco details, industry storage & production rates, passenger station waiting counts
• Signal colorization — finalized dynamic aspect-based colors (red/yellow/green/orange)
• Passenger stop track color — distinct configurable color for station tracks
• Experimental Turntable Map Markers & Controls (by Refizar08) — clickable icons with Ctrl/Alt/Shift+Click rotation controls
• README update