diff --git a/lib/actions/ui.js b/lib/actions/ui.js
index ad04d2805..c4f386244 100644
--- a/lib/actions/ui.js
+++ b/lib/actions/ui.js
@@ -70,13 +70,15 @@ export function matchContentToUrl (location) {
         // Parse comma separated params (ensuring numbers are parsed correctly).
         let [lat, lon, zoom, routerId] = id ? idToParams(id) : []
         if (!lat || !lon) {
-          // Attempt to parse path. (Legacy UI otp.js used slashes in the
-          // pathname to specify lat, lon, etc.)
+          // Attempt to parse path if lat/lon not found. (Legacy UI otp.js used
+          // slashes in the pathname to specify lat, lon, etc.)
           [,, lat, lon, zoom, routerId] = idToParams(location.pathname, '/')
         }
+        console.log(lat, lon, zoom, routerId)
         // Update map location/zoom and optionally override router ID.
-        dispatch(setMapCenter({ lat, lon }))
-        dispatch(setMapZoom({ zoom }))
+        if (+lat && +lon) dispatch(setMapCenter({ lat, lon }))
+        if (+zoom) dispatch(setMapZoom({ zoom }))
+        // If router ID is provided, override the default routerId.
         if (routerId) dispatch(setRouterId(routerId))
         dispatch(setMainPanelContent(null))
         break
@@ -88,6 +90,10 @@ export function matchContentToUrl (location) {
   }
 }
 
+/**
+ * Split the path id into its parts (according to specified delimiter). Parse
+ * numbers if detected.
+ */
 function idToParams (id, delimiter = ',') {
   return id.split(delimiter).map(s => isNaN(s) ? s : +s)
 }
diff --git a/lib/components/app/responsive-webapp.js b/lib/components/app/responsive-webapp.js
index 9705cd327..92d98be1f 100644
--- a/lib/components/app/responsive-webapp.js
+++ b/lib/components/app/responsive-webapp.js
@@ -105,20 +105,20 @@ class ResponsiveWebapp extends Component {
         { enableHighAccuracy: true }
       )
     }
-
+    // Handle routing to a specific part of the app (e.g. stop viewer) on page
+    // load. (This happens prior to routing request in case special routerId is
+    // set from URL.)
+    this.props.matchContentToUrl(this.props.location)
     if (location && location.search) {
       // Set search params and plan trip if routing enabled and a query exists
       // in the URL.
       this.props.parseUrlQueryString()
     }
-    // Handle routing to a specific part of the app (e.g. stop viewer) on page
-    // load.
-    this.props.matchContentToUrl(this.props.location)
   }
 
   componentWillUnmount () {
     // Remove on back button press listener.
-    window.removeEventListener('popstate')
+    window.removeEventListener('popstate', this.props.handleBackButtonPress)
   }
 
   render () {
diff --git a/lib/components/narrative/trip-tools.js b/lib/components/narrative/trip-tools.js
index 150dfa1fe..2717bf26f 100644
--- a/lib/components/narrative/trip-tools.js
+++ b/lib/components/narrative/trip-tools.js
@@ -77,10 +77,24 @@ class CopyUrlButton extends Component {
     this.state = { showCopied: false }
   }
 
+  _resetState = () => this.setState({ showCopied: false })
+
   _onClick = () => {
-    copyToClipboard(window.location.href)
+    // If special routerId has been set in session storage, construct copy URL
+    // for itinerary with #/start/ prefix to set routerId on page load.
+    const routerId = window.sessionStorage.getItem('routerId')
+    let url = window.location.href
+    if (routerId) {
+      const parts = url.split('#')
+      if (parts.length === 2) {
+        url = `${parts[0]}#/start/x/x/x/${routerId}${parts[1]}`
+      } else {
+        console.warn('URL not formatted as expected, copied URL will not contain session routerId.', routerId)
+      }
+    }
+    copyToClipboard(url)
     this.setState({ showCopied: true })
-    setTimeout(() => { this.setState({ showCopied: false }) }, 2000)
+    window.setTimeout(this._resetState, 2000)
   }
 
   render () {
diff --git a/lib/reducers/create-otp-reducer.js b/lib/reducers/create-otp-reducer.js
index 61ced6a35..90fd3f7b6 100644
--- a/lib/reducers/create-otp-reducer.js
+++ b/lib/reducers/create-otp-reducer.js
@@ -119,6 +119,20 @@ export function getInitialState (userDefinedConfig, initialQuery) {
   if (config.locations) {
     locations.push(...config.locations.map(l => ({ ...l, type: 'suggested' })))
   }
+  // Check for alternative routerId in session storage. This is generally used
+  // for testing single GTFS feed OTP graphs that are deployed to feed-specific
+  // routers (e.g., https://otp.server.com/otp/routers/non_default_router).
+  // This routerId session value is initially set by visiting otp-rr
+  // with the path /start/:latLonZoomRouter, which dispatches the SET_ROUTER_ID
+  // action and stores the value in sessionStorage.
+  // Note: this mechanism assumes that the OTP API path is otp/routers/default.
+  const routerId = window.sessionStorage.getItem('routerId')
+  // If routerId is found, update the config.api.path (keep the original config
+  // value at originalPath in case it needs to be reverted.)
+  if (routerId) {
+    config.api.originalPath = userDefinedConfig.api.path
+    config.api.path = `/otp/routers/${routerId}`
+  }
   let queryModes = currentQuery.mode.split(',')
 
   // If 'TRANSIT' is included in the mode list, replace it with individual modes
@@ -540,11 +554,23 @@ function createOtpReducer (config, initialQuery) {
           }
         })
       case 'SET_ROUTER_ID':
-        const routerId = action.payload || 'default'
+        const routerId = action.payload
+        // Store original path value in originalPath variable.
+        const originalPath = config.api.originalPath || config.api.path || '/otp/routers/default'
+        const path = routerId
+          ? `/otp/routers/${routerId}`
+          // If routerId is null, revert to the original config's API path (or
+          // the standard path if that is not found).
+          : originalPath
+        // Store routerId in session storage (persists through page reloads but
+        // not when a new tab/window is opened).
+        if (routerId) window.sessionStorage.setItem('routerId', routerId)
+        else window.sessionStorage.removeItem('routerId')
         return update(state, {
           config: {
             api: {
-              path: { $set: `/otp/routers/${routerId}` }
+              path: { $set: path },
+              originalPath: { $set: originalPath }
             }
           }
         })