diff --git a/core/kt-osrd-rjs-parser/src/main/kotlin/fr/sncf/osrd/RawInfraRJSParser.kt b/core/kt-osrd-rjs-parser/src/main/kotlin/fr/sncf/osrd/RawInfraRJSParser.kt
index 7aa8a5bebb6..dae8f06c1fb 100644
--- a/core/kt-osrd-rjs-parser/src/main/kotlin/fr/sncf/osrd/RawInfraRJSParser.kt
+++ b/core/kt-osrd-rjs-parser/src/main/kotlin/fr/sncf/osrd/RawInfraRJSParser.kt
@@ -279,7 +279,7 @@ private fun buildZones(builder: RawInfraBuilder) {
     val nodeHasZone = BooleanArray(builder.getTrackNodes().size.toInt()) { false }
 
     // TODO: change this algorithm to add all nodes to zones separately from iterating on track
-    // sections
+    //       sections
     for (trackSectionIdx in builder.getTrackSections()) {
         val detectors = builder.getTrackSectionDetectors(trackSectionIdx)
 
diff --git a/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraBuilder.kt b/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraBuilder.kt
index ccd2c00f133..2b691d20fcc 100644
--- a/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraBuilder.kt
+++ b/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraBuilder.kt
@@ -362,6 +362,14 @@ class RawInfraBuilder {
     }
 
     fun setNextZone(detector: DirDetectorId, zone: ZoneId) {
+        if (nextZones[detector.opposite] == zone) {
+            // Invalid detector if the zone is identical on both sides: data issue
+            // (wrong place for detector or missing detectors around to avoid "zone-loop").
+            // This often leads to self-conflicts on trains.
+            logger.warn {
+                "detector ${detectorPool[detector.value].names} is not bounding a zone (both sides are inside a unique zone)"
+            }
+        }
         nextZones[detector] = zone
     }
 
diff --git a/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraImpl.kt b/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraImpl.kt
index d5eec9e3034..3ed5ea44223 100644
--- a/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraImpl.kt
+++ b/core/kt-osrd-sim-infra/src/main/kotlin/fr/sncf/osrd/sim_infra/impl/RawInfraImpl.kt
@@ -14,7 +14,7 @@ import kotlin.collections.set
 import kotlin.time.Duration
 import mu.KotlinLogging
 
-private val logger = KotlinLogging.logger {}
+val logger = KotlinLogging.logger {}
 
 // TODO: refactor this structure (and its usage) to be able to model a speed limit affecting only
 //       trains using one specific route AND one specific speedLimitTag