• Click & Drag: Click anywhere on the terrain map to drop alignment nodes. Click and drag existing nodes to reposition them across contours.
• Delete Key: Select any node and press Delete or Backspace (or click the red "Delete Node" button) to remove it.
• Insert Nodes: Click on an existing track tangent between two nodes to split the segment and add a new intermediate node.

• Tangent Handles: Drag the tangent direction handles radiating from nodes to shape smooth transition curves and spiral approaches.
• Radius Limits: Curve radius below the locomotive threshold (< 100m) will trigger warning banners and slow down trains.
• Curve Resistance: Sharp curves add frictional drag equivalent to additional uphill gradient!

• Profile Canvas: The bottom panel renders the terrain cross-section. Drag elevation nodes vertically to balance cut-and-fill earthworks.
• Locking Height: Enable "Lock Height" on station or viaduct nodes to anchor elevation and prevent shifts during realignment.
• Cut & Fill CapEx: Deep cuts ($1.50/m³) and fills ($2.50/m³) rapidly drain your project budget limit.

The steepest grade on your entire route is the Ruling Grade. It limits train length for all traffic across the line: