diff --git a/editoast/openapi.yaml b/editoast/openapi.yaml
index fec78f868ce..f4370672f89 100644
--- a/editoast/openapi.yaml
+++ b/editoast/openapi.yaml
@@ -4961,6 +4961,14 @@ components:
     ProjectPathInput:
       description: Project path input is described by a list of routes and a list of track range
       properties:
+        blocks:
+          description: Path description as block ids
+          items:
+            maxLength: 255
+            minLength: 1
+            type: string
+          minItems: 1
+          type: array
         routes:
           description: List of route ids
           items:
@@ -4976,8 +4984,9 @@ components:
           minItems: 1
           type: array
       required:
-      - routes
       - track_section_ranges
+      - routes
+      - blocks
       type: object
     ProjectPathTrainResult:
       allOf:
diff --git a/editoast/src/core/v2/signal_updates.rs b/editoast/src/core/v2/signal_updates.rs
index 929e4d5d0d1..e0bcf9bb1e1 100644
--- a/editoast/src/core/v2/signal_updates.rs
+++ b/editoast/src/core/v2/signal_updates.rs
@@ -20,6 +20,8 @@ pub struct SignalUpdatesRequest<'a> {
     pub track_section_ranges: &'a Vec<TrackRange>,
     /// Path description as route ids
     pub routes: &'a Vec<Identifier>,
+    /// Path description as block ids
+    pub blocks: &'a Vec<Identifier>,
     /// List of signal sightings and zone updates for each train
     pub train_simulations: HashMap<i64, TrainSimulation<'a>>,
 }
diff --git a/editoast/src/views/v2/train_schedule/projection.rs b/editoast/src/views/v2/train_schedule/projection.rs
index b5ee9ef7d17..ef5d4baf5d2 100644
--- a/editoast/src/views/v2/train_schedule/projection.rs
+++ b/editoast/src/views/v2/train_schedule/projection.rs
@@ -59,12 +59,15 @@ crate::routes! {
 /// Project path input is described by a list of routes and a list of track range
 #[derive(Debug, Deserialize, Serialize, ToSchema)]
 struct ProjectPathInput {
-    /// List of route ids
-    #[schema(inline, min_items = 1)]
-    routes: Vec<Identifier>,
     /// List of track ranges
     #[schema(min_items = 1)]
     track_section_ranges: Vec<TrackRange>,
+    /// List of route ids
+    #[schema(inline, min_items = 1)]
+    routes: Vec<Identifier>,
+    /// Path description as block ids
+    #[schema(inline, min_items = 1)]
+    blocks: Vec<Identifier>,
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize, ToSchema)]
@@ -128,6 +131,7 @@ async fn project_path(
     let ProjectPathInput {
         track_section_ranges: path_track_ranges,
         routes: path_routes,
+        blocks: path_blocks,
     } = data.into_inner();
     let path_projection = PathProjection::new(&path_track_ranges);
     let query_props = params.into_inner();
@@ -208,6 +212,7 @@ async fn project_path(
             &train_details,
             &path_track_ranges,
             &path_routes,
+            &path_blocks,
         );
         let projection: Option<CachedProjectPathTrainResult> = redis_conn
             .json_get_ex(&hash, CACHE_PROJECTION_EXPIRATION)
@@ -232,6 +237,7 @@ async fn project_path(
             &infra,
             &path_track_ranges,
             &path_routes,
+            &path_blocks,
             &miss_cache
         )
     );
@@ -245,6 +251,7 @@ async fn project_path(
             &train_details,
             &path_track_ranges,
             &path_routes,
+            &path_blocks,
         );
         let cached = CachedProjectPathTrainResult {
             space_time_curves: space_time_curves
@@ -308,15 +315,17 @@ struct TrainSimulationDetails {
 async fn compute_batch_signal_updates<'a>(
     core: Arc<CoreClient>,
     infra: &Infra,
-    track_section_ranges: &'a Vec<TrackRange>,
-    routes: &'a Vec<Identifier>,
+    path_track_ranges: &'a Vec<TrackRange>,
+    path_routes: &'a Vec<Identifier>,
+    path_blocks: &'a Vec<Identifier>,
     trains_details: &'a HashMap<i64, TrainSimulationDetails>,
 ) -> Result<HashMap<i64, Vec<SignalUpdate>>> {
     let request = SignalUpdatesRequest {
         infra: infra.id,
         expected_version: infra.version.clone(),
-        track_section_ranges,
-        routes,
+        track_section_ranges: path_track_ranges,
+        routes: path_routes,
+        blocks: path_blocks,
         train_simulations: trains_details
             .iter()
             .map(|(id, details)| {
@@ -489,12 +498,14 @@ fn train_projection_input_hash(
     project_path_input: &TrainSimulationDetails,
     path_projection_tracks: &[TrackRange],
     path_routes: &[Identifier],
+    path_blocks: &[Identifier],
 ) -> String {
     let osrd_version = get_app_version().unwrap_or_default();
     let mut hasher = DefaultHasher::new();
     project_path_input.hash(&mut hasher);
     path_projection_tracks.hash(&mut hasher);
     path_routes.hash(&mut hasher);
+    path_blocks.hash(&mut hasher);
     let hash_simulation_input = hasher.finish();
     format!("projection_{osrd_version}.{infra_id}.{infra_version}.{hash_simulation_input}")
 }
diff --git a/front/src/common/api/osrdEditoastApi.ts b/front/src/common/api/osrdEditoastApi.ts
index 93c81983975..f3954ddb923 100644
--- a/front/src/common/api/osrdEditoastApi.ts
+++ b/front/src/common/api/osrdEditoastApi.ts
@@ -3300,6 +3300,8 @@ export type ProjectPathTrainResult = {
   rolling_stock_length: number;
 };
 export type ProjectPathInput = {
+  /** Path description as block ids */
+  blocks: string[];
   /** List of route ids */
   routes: string[];
   /** List of track ranges */