diff --git a/src/models/RunnerCard.ts b/src/models/RunnerCard.ts
index 151f58c..b5a3e5a 100644
--- a/src/models/RunnerCard.ts
+++ b/src/models/RunnerCard.ts
@@ -1,4 +1,4 @@
-import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from "typeorm";
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, OneToMany } from "typeorm";
 import {
   IsBoolean,
   IsInt,
@@ -7,6 +7,7 @@ import {
   IsString,
 } from "class-validator";
 import { Runner } from "./Runner";
+import { TrackScan } from "./TrackScan";
 
 /**
  * Defines a card that can be scanned via a scanner station.
@@ -46,4 +47,10 @@ export class RunnerCard {
   @Column()
   @IsBoolean()
   enabled = true;
+
+  /**
+   * Used to link cards to a track scans.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track)
+  scans: TrackScan[];
 }
diff --git a/src/models/ScanStation.ts b/src/models/ScanStation.ts
index cd317af..5950ad0 100644
--- a/src/models/ScanStation.ts
+++ b/src/models/ScanStation.ts
@@ -1,4 +1,4 @@
-import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from "typeorm";
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, OneToMany } from "typeorm";
 import {
   IsBoolean,
   IsInt,
@@ -7,6 +7,7 @@ import {
   IsString,
 } from "class-validator";
 import { Track } from "./Track";
+import { TrackScan } from "./TrackScan";
 
 /**
  * ScannerStations have the ability to create scans for specific tracks.
@@ -51,4 +52,10 @@ export class ScanStation {
   @Column()
   @IsBoolean()
   enabled = true;
+
+  /**
+   * Used to link track scans to a scan station.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track)
+  scans: TrackScan[];
 }
diff --git a/src/models/Track.ts b/src/models/Track.ts
index e8689a4..eda6def 100644
--- a/src/models/Track.ts
+++ b/src/models/Track.ts
@@ -7,6 +7,7 @@ import {
   IsString,
 } from "class-validator";
 import { ScanStation } from "./ScanStation";
+import { TrackScan } from "./TrackScan";
 
 /**
  * Defines a track of given length.
@@ -42,4 +43,10 @@ export class Track {
    */
   @OneToMany(() => ScanStation, station => station.track)
   stations: ScanStation[];
+
+  /**
+   * Used to link track scans to a track.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track)
+  scans: TrackScan[];
 }
diff --git a/src/models/TrackScan.ts b/src/models/TrackScan.ts
index f6ffb81..5eeb1bf 100644
--- a/src/models/TrackScan.ts
+++ b/src/models/TrackScan.ts
@@ -30,7 +30,7 @@ export class TrackScan extends Scan {
    */
   @Column()
   @IsNotEmpty()
-  //TODO: Relationship
+  @ManyToOne(() => Track, track => track.scans)
   track: Track;
 
   /**
@@ -38,7 +38,7 @@ export class TrackScan extends Scan {
    */
   @Column()
   @IsNotEmpty()
-  //TODO: Relationship
+  @ManyToOne(() => RunnerCard, card => card.scans)
   card: RunnerCard;
 
   /**
@@ -46,7 +46,7 @@ export class TrackScan extends Scan {
    */
   @Column()
   @IsNotEmpty()
-  //TODO: Relationship
+  @ManyToOne(() => ScanStation, station => station.scans)
   station: ScanStation;
 
   /**