diff --git a/svelte-app/src/lib/canvas/interactions.ts b/svelte-app/src/lib/canvas/interactions.ts
index 25f5f2d..d652a3e 100644
--- a/svelte-app/src/lib/canvas/interactions.ts
+++ b/svelte-app/src/lib/canvas/interactions.ts
@@ -100,12 +100,30 @@ function hitTest(cx: number, cy: number): number | null {
   return hitTestSymbols(cx, cy, layout.symbols);
 }
 
+/** Get the conveyance family for a symbol ID.
+ *  Conveyor family: conveyor, spur, curved_conv, induction, extendo
+ *  Chute family: chute, tipper, curved_chute */
+function getConveyanceFamily(symbolId: string): string | null {
+  if (symbolId.startsWith('conveyor') || symbolId.startsWith('spur') ||
+      symbolId.startsWith('curved_conv') || symbolId.startsWith('induction') ||
+      symbolId.startsWith('extendo')) return 'conveyor';
+  if (symbolId.startsWith('chute') || symbolId.startsWith('tipper') ||
+      symbolId.startsWith('curved_chute')) return 'chute';
+  return null;
+}
+
 /** Check if a device type (symbolDef) is compatible with a placed symbol for label assignment.
- *  Matches by SVG file so base and _v variants are treated as the same type. */
+ *  Matches by conveyance family so conveyor devices can drop on spurs/curves too. */
 function isTypeCompatible(symbolDef: (typeof SYMBOLS)[number], placedSymbolId: string): boolean {
   const placedDef = SYMBOLS.find(s => s.id === placedSymbolId);
   if (!placedDef) return false;
-  return symbolDef.file === placedDef.file;
+  // Same SVG file (base + _v variants)
+  if (symbolDef.file === placedDef.file) return true;
+  // Same conveyance family
+  const dragFamily = getConveyanceFamily(symbolDef.id);
+  const targetFamily = getConveyanceFamily(placedSymbolId);
+  if (dragFamily && dragFamily === targetFamily) return true;
+  return false;
 }
 
 function onCanvasMousedown(e: MouseEvent) {