diff --git a/railsignal-app/src/api/components.js b/railsignal-app/src/api/components.js
index ecb5c76..57268cb 100644
--- a/railsignal-app/src/api/components.js
+++ b/railsignal-app/src/api/components.js
@@ -48,6 +48,27 @@ export function getComponent(rs, id) {
     });
 }
 
+/**
+ * Searches through the rail system's components.
+ * @param {RailSystem} rs
+ * @param {string|null} searchQuery
+ * @return {Promise<Object>}
+ */
+export function searchComponents(rs, searchQuery) {
+    return new Promise((resolve, reject) => {
+        const params = {
+            page: 0,
+            size: 25
+        };
+        if (searchQuery) params.q = searchQuery;
+        axios.get(`${API_URL}/rs/${rs.id}/c/search`, {params: params})
+            .then(response => {
+                resolve(response.data);
+            })
+            .catch(reject);
+    });
+}
+
 export function createComponent(rs, data) {
     return new Promise((resolve, reject) => {
         axios.post(`${API_URL}/rs/${rs.id}/c`, data)
diff --git a/railsignal-app/src/api/linkTokens.js b/railsignal-app/src/api/linkTokens.js
new file mode 100644
index 0000000..38e601c
--- /dev/null
+++ b/railsignal-app/src/api/linkTokens.js
@@ -0,0 +1,57 @@
+import {API_URL} from "./constants";
+import axios from "axios";
+
+/**
+ * A token that's used by components to provide real-time up and down links.
+ */
+export class LinkToken {
+    constructor(data) {
+        this.id = data.id;
+        this.label = data.label;
+        this.components = data.components;
+    }
+}
+
+/**
+ * Gets the list of link tokens in a rail system.
+ * @param {RailSystem} rs
+ * @return {Promise<LinkToken[]>}
+ */
+export function getTokens(rs) {
+    return new Promise((resolve, reject) => {
+        axios.get(`${API_URL}/rs/${rs.id}/lt`)
+            .then(response => {
+                resolve(response.data.map(obj => new LinkToken(obj)));
+            })
+            .catch(reject);
+    });
+}
+
+/**
+ * Creates a new link token.
+ * @param {RailSystem} rs
+ * @param {LinkToken} data
+ * @return {Promise<string>} A promise that resolves to the token that was created.
+ */
+export function createLinkToken(rs, data) {
+    return new Promise((resolve, reject) => {
+        axios.post(`${API_URL}/rs/${rs.id}/lt`, data)
+            .then(response => {
+                resolve(response.data.token);
+            })
+            .catch(reject);
+    });
+}
+
+/**
+ * Deletes a link token.
+ * @param {RailSystem} rs
+ * @param {Number} tokenId
+ */
+export function deleteToken(rs, tokenId) {
+    return new Promise((resolve, reject) => {
+        axios.delete(`${API_URL}/rs/${rs.id}/lt/${tokenId}`)
+            .then(resolve)
+            .catch(reject);
+    });
+}
\ No newline at end of file
diff --git a/railsignal-app/src/api/paths.js b/railsignal-app/src/api/paths.js
index afd74f5..0e2db39 100644
--- a/railsignal-app/src/api/paths.js
+++ b/railsignal-app/src/api/paths.js
@@ -2,6 +2,12 @@ import axios from "axios";
 import {API_URL} from "./constants";
 import {refreshSomeComponents} from "./components";
 
+/**
+ * Updates the connections to a path node.
+ * @param {RailSystem} rs The rail system to which the node belongs.
+ * @param {Object} node The node to update.
+ * @returns {Promise}
+ */
 export function updateConnections(rs, node) {
     return new Promise((resolve, reject) => {
         axios.patch(
@@ -16,11 +22,25 @@ export function updateConnections(rs, node) {
     });
 }
 
+/**
+ * Adds a connection to a path node.
+ * @param {RailSystem} rs
+ * @param {Object} node
+ * @param {Object} other
+ * @returns {Promise}
+ */
 export function addConnection(rs, node, other) {
     node.connectedNodes.push(other);
     return updateConnections(rs, node);
 }
 
+/**
+ * Removes a connection from a path node.
+ * @param {RailSystem} rs
+ * @param {Object} node
+ * @param {Object} other
+ * @returns {Promise}
+ */
 export function removeConnection(rs, node, other) {
     const idx = node.connectedNodes.findIndex(n => n.id === other.id);
     return new Promise((resolve, reject) => {
diff --git a/railsignal-app/src/api/railSystems.js b/railsignal-app/src/api/railSystems.js
index 10b8660..c01c1d9 100644
--- a/railsignal-app/src/api/railSystems.js
+++ b/railsignal-app/src/api/railSystems.js
@@ -1,11 +1,26 @@
 import axios from "axios";
 import {API_URL} from "./constants";
 
+export class RailSystem {
+    constructor(data) {
+        this.id = data.id;
+        this.name = data.name;
+        this.segments = [];
+        this.components = [];
+        this.websocket = null;
+        this.selectedComponent = null;
+    }
+}
+
 export function refreshRailSystems(rsStore) {
     return new Promise(resolve => {
         axios.get(`${API_URL}/rs`)
             .then(response => {
-                rsStore.railSystems = response.data;
+                const rsItems = response.data;
+                rsStore.railSystems.length = 0;
+                for (let i = 0; i < rsItems.length; i++) {
+                    rsStore.railSystems.push(new RailSystem(rsItems[i]));
+                }
                 resolve();
             })
             .catch(error => console.error(error));
diff --git a/railsignal-app/src/api/websocket.js b/railsignal-app/src/api/websocket.js
index 3f4276d..741c548 100644
--- a/railsignal-app/src/api/websocket.js
+++ b/railsignal-app/src/api/websocket.js
@@ -1,9 +1,11 @@
 import {WS_URL} from "./constants";
 
+/**
+ * Establishes a websocket connection to the given rail system.
+ * @param {RailSystem} rs
+ */
 export function establishWebsocketConnection(rs) {
-    if (rs.websocket) {
-        rs.websocket.close();
-    }
+    closeWebsocketConnection(rs);
     rs.websocket = new WebSocket(`${WS_URL}/${rs.id}`);
     rs.websocket.onopen = () => {
         console.log("Opened websocket connection to rail system " + rs.id);
@@ -25,6 +27,10 @@ export function establishWebsocketConnection(rs) {
     };
 }
 
+/**
+ * Closes the websocket connection to a rail system, if possible.
+ * @param {RailSystem} rs
+ */
 export function closeWebsocketConnection(rs) {
     if (rs.websocket) {
         rs.websocket.close();
diff --git a/railsignal-app/src/components/AppNavbar.vue b/railsignal-app/src/components/AppNavbar.vue
index efc5878..b946953 100644
--- a/railsignal-app/src/components/AppNavbar.vue
+++ b/railsignal-app/src/components/AppNavbar.vue
@@ -15,6 +15,7 @@
                 id="railSystemSelect"
                 v-model="rsStore.selectedRailSystem"
                 class="form-select form-select-sm"
+                @change="rsStore.onSelectedRailSystemChanged()"
             >
               <option v-for="rs in rsStore.railSystems" :key="rs.id" :value="rs">
                 {{rs.name}}
diff --git a/railsignal-app/src/components/railsystem/CreateLinkTokenModal.vue b/railsignal-app/src/components/railsystem/CreateLinkTokenModal.vue
new file mode 100644
index 0000000..746380f
--- /dev/null
+++ b/railsignal-app/src/components/railsystem/CreateLinkTokenModal.vue
@@ -0,0 +1,115 @@
+<template>
+  <div class="modal fade" tabindex="-1" id="createLinkTokenModal">
+    <div class="modal-dialog">
+      <div class="modal-content">
+        <div class="modal-header">
+          <h5 class="modal-title">Create Link Token</h5>
+          <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+        </div>
+        <div class="modal-body">
+          <p>
+            Create a <em>link token</em> to link components in this rail system
+            to actual devices in your system, so your world can talk to this
+            system. Each link token should have a unique label that can be used
+            to identify it, and a list of components that it's linked to.
+          </p>
+          <p>
+            Note that for security purposes, the raw token that's generated is
+            only shown once, and is never available again. If you lose the
+            token, you must create a new one instead and delete the old one.
+          </p>
+          <form>
+            <div class="mb-3">
+              <label for="createLinkTokenLabel" class="form-label">Label</label>
+              <input
+                  id="createLinkTokenLabel"
+                  class="form-control"
+                  type="text"
+                  v-model="formData.label"
+                  required
+              />
+            </div>
+            <div class="mb-3">
+              <label class="form-label" for="createLinkTokenComponentSelect">Select Components to Link</label>
+              <ComponentSelector id="createLinkTokenComponentSelect" :railSystem="railSystem"  v-model="components"/>
+            </div>
+          </form>
+          <div v-if="warnings.length > 0">
+            <div v-for="msg in warnings" :key="msg" class="alert alert-danger mt-2">
+              {{msg}}
+            </div>
+          </div>
+          <div v-if="token !== null" class="alert alert-success mt-2">
+            Created token: {{token}}
+            <br>
+            <small>Copy this token now; it will not be shown again.</small>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button type="button" class="btn btn-secondary" data-bs-dismiss="modal" @click="reset()">Close</button>
+          <button
+              type="button"
+              class="btn btn-primary"
+              @click="formSubmitted()"
+              v-if="token == null"
+          >
+            Add
+          </button>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script>
+import {createLinkToken} from "../../api/linkTokens";
+import {RailSystem} from "../../api/railSystems";
+import ComponentSelector from "./util/ComponentSelector.vue";
+
+export default {
+  name: "CreateLinkTokenModal",
+  components: {ComponentSelector},
+  props: {
+    railSystem: {
+      type: RailSystem,
+      required: true
+    }
+  },
+  data() {
+    return {
+      formData: {
+        label: "",
+        componentIds: []
+      },
+      components: [],
+      warnings: [],
+      token: null
+    };
+  },
+  methods: {
+    formSubmitted() {
+      this.formData.componentIds = this.components.map(c => c.id);
+      createLinkToken(this.railSystem, this.formData)
+          .then(token => {
+            this.token = token;
+          })
+          .catch(error => {
+            this.warnings.length = 0;
+            this.warnings.push("Couldn't create token: " + error.response.data.message);
+          });
+    },
+    reset() {
+      // TODO: Fix this!! Reset doesn't work.
+      this.formData.label = "";
+      this.formData.componentIds = [];
+      this.components = [];
+      this.warnings = [];
+      this.token = null;
+    }
+  }
+}
+</script>
+
+<style scoped>
+
+</style>
\ No newline at end of file
diff --git a/railsignal-app/src/components/railsystem/RailSystemPropertiesView.vue b/railsignal-app/src/components/railsystem/RailSystemPropertiesView.vue
index fa72e1f..a7e25e8 100644
--- a/railsignal-app/src/components/railsystem/RailSystemPropertiesView.vue
+++ b/railsignal-app/src/components/railsystem/RailSystemPropertiesView.vue
@@ -1,7 +1,7 @@
 <template>
   <h3>Rail System: <em>{{railSystem.name}}</em></h3>
   <SegmentsView :segments="railSystem.segments" v-if="railSystem.segments"/>
-  <div class="dropdown">
+  <div class="dropdown d-inline-block me-2">
     <button class="btn btn-success btn-sm dropdown-toggle" type="button" id="railSystemAddComponentsToggle" data-bs-toggle="dropdown" aria-expanded="false">
       Add Component
     </button>
@@ -48,6 +48,17 @@
       </li>
     </ul>
   </div>
+  <div v-if="createLinkTokenAllowed()" class="d-inline-block">
+    <button
+      class="btn btn-success btn-sm"
+      type="button"
+      data-bs-toggle="modal"
+      data-bs-target="#createLinkTokenModal"
+    >
+      Create Link Token
+    </button>
+    <CreateLinkTokenModal :railSystem="railSystem" />
+  </div>
   <AddSegmentModal />
   <AddSignalModal v-if="addSignalAllowed()" />
   <AddSegmentBoundaryModal v-if="addSegmentBoundaryAllowed()" />
@@ -60,10 +71,13 @@ import AddSegmentModal from "./AddSegmentModal.vue";
 import AddSignalModal from "./component/AddSignalModal.vue";
 import AddSegmentBoundaryModal from "./component/AddSegmentBoundaryModal.vue";
 import AddSwitchModal from "./component/AddSwitchModal.vue";
+import CreateLinkTokenModal from "./CreateLinkTokenModal.vue";
+import {RailSystem} from "../../api/railSystems";
 
 export default {
   name: "RailSystemPropertiesView",
   components: {
+    CreateLinkTokenModal,
     AddSwitchModal,
     AddSegmentBoundaryModal,
     AddSignalModal,
@@ -72,19 +86,22 @@ export default {
   },
   props: {
     railSystem: {
-      type: Object,
+      type: RailSystem,
       required: true
     }
   },
   methods: {
     addSignalAllowed() {
-      return this.railSystem.segments && this.railSystem.segments.length > 0
+      return this.railSystem.segments && this.railSystem.segments.length > 0;
     },
     addSegmentBoundaryAllowed() {
-      return this.railSystem.segments && this.railSystem.segments.length > 1
+      return this.railSystem.segments && this.railSystem.segments.length > 1;
     },
     addSwitchAllowed() {
-      return this.railSystem.components && this.railSystem.components.length > 1
+      return this.railSystem.components && this.railSystem.components.length > 1;
+    },
+    createLinkTokenAllowed() {
+      return this.railSystem.components && this.railSystem.components.length > 0;
     }
   }
 }
diff --git a/railsignal-app/src/components/railsystem/util/ComponentSelector.vue b/railsignal-app/src/components/railsystem/util/ComponentSelector.vue
new file mode 100644
index 0000000..835b00f
--- /dev/null
+++ b/railsignal-app/src/components/railsystem/util/ComponentSelector.vue
@@ -0,0 +1,106 @@
+<template>
+  <div class="border p-2">
+    <input type="text" class="form-control mb-2" placeholder="Search for components" v-model="searchQuery" @keyup="refreshComponents()" />
+    <ul class="list-group list-group-flush" style="overflow: auto; max-height: 200px">
+      <li
+        class="list-group-item"
+        v-for="component in possibleComponents"
+        :key="component.id"
+      >
+        {{component.name}}
+
+        <button
+          type="button"
+          class="badge btn btn-sm btn-success float-end"
+          @click="selectComponent(component)"
+          v-if="!isComponentSelected(component)"
+        >
+          Select
+        </button>
+        <span v-if="isComponentSelected(component)" class="badge bg-secondary float-end">Selected</span>
+      </li>
+    </ul>
+    <div v-if="selectedComponents.length > 0" class="mt-2">
+      <span
+          class="badge bg-secondary me-1 mb-1"
+          v-for="component in selectedComponents"
+          :key="component.id"
+      >
+        {{component.name}}
+        <button class="badge rounded-pill bg-danger" @click="deselectComponent(component)">
+          X
+        </button>
+      </span>
+    </div>
+    <button
+      class="btn btn-sm btn-secondary"
+      type="button"
+      v-if="selectedComponents.length > 1"
+      @click="selectedComponents.length = 0"
+    >
+      Clear All
+    </button>
+  </div>
+</template>
+
+<script>
+import {RailSystem} from "../../../api/railSystems";
+import {searchComponents} from "../../../api/components";
+
+export default {
+  name: "ComponentSelector",
+  props: {
+    railSystem: {
+      type: RailSystem,
+      required: true
+    },
+    modelValue: {
+      type: Array,
+      required: true
+    }
+  },
+  emits: ["update:modelValue"],
+  data() {
+    return {
+      searchQuery: null,
+      selectedComponents: [],
+      possibleComponents: []
+    };
+  },
+  mounted() {
+    this.refreshComponents();
+  },
+  methods: {
+    refreshComponents() {
+      searchComponents(this.railSystem, this.searchQuery)
+          .then(page => this.possibleComponents = page.content);
+    },
+    isComponentSelected(component) {
+      return this.selectedComponents.some(c => c.id === component.id);
+    },
+    selectComponent(component) {
+      if (this.isComponentSelected(component)) return;
+      this.selectedComponents.push(component);
+      this.selectedComponents.sort((a, b) => {
+        const nameA = a.name.toUpperCase();
+        const nameB = b.name.toUpperCase();
+        if (nameA < nameB) return -1;
+        if (nameA > nameB) return 1;
+        return 0;
+      });
+      this.$emit("update:modelValue", this.selectedComponents);
+    },
+    deselectComponent(component) {
+      const idx = this.selectedComponents.findIndex(c => c.id === component.id);
+      if (idx > -1) {
+        this.selectedComponents.splice(idx, 1);
+        this.$emit("update:modelValue", this.selectedComponents);
+      }
+    }
+  }
+}
+</script>
+
+<style scoped>
+
+</style>
\ No newline at end of file
diff --git a/railsignal-app/src/main.js b/railsignal-app/src/main.js
index c0af016..b50d2ca 100644
--- a/railsignal-app/src/main.js
+++ b/railsignal-app/src/main.js
@@ -1,22 +1,11 @@
-import { createApp } from 'vue';
-import { createPinia } from 'pinia';
+import {createApp} from 'vue';
+import {createPinia} from 'pinia';
 import App from './App.vue'
 import "bootstrap/dist/css/bootstrap.min.css";
 import "bootstrap";
-import {useRailSystemsStore} from "./stores/railSystemsStore";
 
 
 const pinia = createPinia();
 const app = createApp(App);
 app.use(pinia);
-
-// Configure rail system updates.
-const rsStore = useRailSystemsStore();
-rsStore.$subscribe(mutation => {
-    const evt = mutation.events;
-    if (evt.key === "selectedRailSystem" && evt.newValue !== null) {
-        rsStore.onSelectedRailSystemChanged();
-    }
-});
-
 app.mount('#app')
diff --git a/railsignal-app/src/stores/railSystemsStore.js b/railsignal-app/src/stores/railSystemsStore.js
index b81c349..6defbda 100644
--- a/railsignal-app/src/stores/railSystemsStore.js
+++ b/railsignal-app/src/stores/railSystemsStore.js
@@ -5,14 +5,12 @@ import {closeWebsocketConnection, establishWebsocketConnection} from "../api/web
 
 export const useRailSystemsStore = defineStore('RailSystemsStore', {
     state: () => ({
+        /**
+         * @type {RailSystem[]}
+         */
         railSystems: [],
         /**
-         * @type {{
-         * segments: [Object],
-         * components: [Object],
-         * selectedComponent: Object | null,
-         * websocket: WebSocket | null
-         * } | null}
+         * @type {RailSystem | null}
          */
         selectedRailSystem: null
     }),
diff --git a/src/main/java/nl/andrewl/railsignalapi/rest/ComponentsApiController.java b/src/main/java/nl/andrewl/railsignalapi/rest/ComponentsApiController.java
index 3b8eead..fc1ce5a 100644
--- a/src/main/java/nl/andrewl/railsignalapi/rest/ComponentsApiController.java
+++ b/src/main/java/nl/andrewl/railsignalapi/rest/ComponentsApiController.java
@@ -29,11 +29,12 @@ public class ComponentsApiController {
 
 	@GetMapping(path = "/search")
 	public Page<SimpleComponentResponse> searchComponents(
+			@PathVariable long rsId,
 			@RequestParam(name = "q", required = false) String searchQuery,
 			@PageableDefault(sort = "name")
 			Pageable pageable
 	) {
-		return componentService.search(searchQuery, pageable);
+		return componentService.search(rsId, searchQuery, pageable);
 	}
 
 	@GetMapping(path = "/{cId}")
diff --git a/src/main/java/nl/andrewl/railsignalapi/service/ComponentService.java b/src/main/java/nl/andrewl/railsignalapi/service/ComponentService.java
index ace76b1..39227f4 100644
--- a/src/main/java/nl/andrewl/railsignalapi/service/ComponentService.java
+++ b/src/main/java/nl/andrewl/railsignalapi/service/ComponentService.java
@@ -16,6 +16,8 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.server.ResponseStatusException;
 
+import javax.persistence.criteria.Predicate;
+import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -42,12 +44,14 @@ public class ComponentService {
 	}
 
 	@Transactional(readOnly = true)
-	public Page<SimpleComponentResponse> search(String searchQuery, Pageable pageable) {
+	public Page<SimpleComponentResponse> search(long rsId, String searchQuery, Pageable pageable) {
 		return componentRepository.findAll((root, query, cb) -> {
+			List<Predicate> predicates = new ArrayList<>(2);
+			predicates.add(cb.equal(root.get("railSystem").get("id"), rsId));
 			if (searchQuery != null && !searchQuery.isBlank()) {
-				return cb.like(cb.lower(root.get("name")), '%' + searchQuery.toLowerCase() + '%');
+				predicates.add(cb.like(cb.lower(root.get("name")), '%' + searchQuery.toLowerCase() + '%'));
 			}
-			return cb.and();
+			return cb.and(predicates.toArray(new Predicate[0]));
 		}, pageable).map(SimpleComponentResponse::new);
 	}