diff --git a/front/src/applications/operationalStudies/components/MacroEditor/import.ts b/front/src/applications/operationalStudies/components/MacroEditor/import.ts
index 18749e5d0de..d21a1cf1985 100644
--- a/front/src/applications/operationalStudies/components/MacroEditor/import.ts
+++ b/front/src/applications/operationalStudies/components/MacroEditor/import.ts
@@ -241,6 +241,18 @@ const importTimetable = async (
     return port;
   };
 
+  let transitionId = 0;
+  const createTransition = (port1Id: number, port2Id: number) => {
+    const transition = {
+      id: transitionId,
+      port1Id,
+      port2Id,
+      isNonStopTransit: false,
+    };
+    transitionId += 1;
+    return transition;
+  };
+
   let trainrunSectionId = 0;
   const trainrunSections: TrainrunSection[] = trainSchedules
     .map((trainSchedule) => {
diff --git a/front/src/applications/operationalStudies/components/MacroEditor/types.ts b/front/src/applications/operationalStudies/components/MacroEditor/types.ts
index 31c494e1d66..a3b93e705f0 100644
--- a/front/src/applications/operationalStudies/components/MacroEditor/types.ts
+++ b/front/src/applications/operationalStudies/components/MacroEditor/types.ts
@@ -14,7 +14,7 @@ export type Node = {
   positionX: number;
   positionY: number;
   ports: Port[];
-  transitions: unknown[];
+  transitions: Transition[];
   connections: unknown[];
   resourceId: number;
   /** Number of tracks where train can stop */
@@ -34,6 +34,13 @@ export type Port = {
   trainrunSectionId: number;
 };
 
+export type Transition = {
+  id: number;
+  port1Id: number;
+  port2Id: number;
+  isNonStopTransit: boolean;
+};
+
 export enum PortAlignment {
   Top,
   Bottom,