diff --git a/src/components/App.jsx b/src/components/App.jsx
index 943879bd..da0aef4b 100644
--- a/src/components/App.jsx
+++ b/src/components/App.jsx
@@ -22,7 +22,7 @@ import SurveyModal from './modals/SurveyModal'
 
 import { downloadGlyphsMetadata, downloadSpriteMetadata } from '../libs/metadata'
 import * as styleSpec from '@mapbox/mapbox-gl-style-spec/style-spec'
-import style from '../libs/style.js'
+import style from '../libs/style'
 import { initialStyleUrl, loadStyleUrl } from '../libs/urlopen'
 import { undoMessages, redoMessages } from '../libs/diffmessage'
 import { loadDefaultStyle, StyleStore } from '../libs/stylestore'
@@ -407,7 +407,7 @@ export default class App extends React.Component {
 
   mapRenderer() {
     const mapProps = {
-      mapStyle: style.replaceAccessToken(this.state.mapStyle, {allowFallback: true}),
+      mapStyle: style.replaceAccessTokens(this.state.mapStyle, {allowFallback: true}),
       options: this.state.mapOptions,
       onDataChange: (e) => {
         this.layerWatcher.analyzeMap(e.map)
diff --git a/src/components/modals/ExportModal.jsx b/src/components/modals/ExportModal.jsx
index c6f397d6..f7d997a1 100644
--- a/src/components/modals/ExportModal.jsx
+++ b/src/components/modals/ExportModal.jsx
@@ -10,7 +10,7 @@ import Button from '../Button'
 import Modal from './Modal'
 import MdFileDownload from 'react-icons/lib/md/file-download'
 import TiClipboard from 'react-icons/lib/ti/clipboard'
-import style from '../../libs/style.js'
+import style from '../../libs/style'
 import GitHub from 'github-api'
 import { CopyToClipboard } from 'react-copy-to-clipboard'
 
@@ -49,7 +49,7 @@ class Gist extends React.Component {
     const mapboxToken = (this.props.mapStyle.metadata || {})['maputnik:mapbox_access_token'];
 
     const mapStyleStr = preview ?
-        styleSpec.format(stripAccessTokens(style.replaceAccessToken(this.props.mapStyle))) :
+        styleSpec.format(stripAccessTokens(style.replaceAccessTokens(this.props.mapStyle))) :
         styleSpec.format(stripAccessTokens(this.props.mapStyle));
     const styleTitle = this.props.mapStyle.name || 'Style';
     const htmlStr = `
@@ -235,7 +235,7 @@ class ExportModal extends React.Component {
   }
 
   downloadStyle() {
-    const tokenStyle = styleSpec.format(stripAccessTokens(style.replaceAccessToken(this.props.mapStyle)));
+    const tokenStyle = styleSpec.format(stripAccessTokens(style.replaceAccessTokens(this.props.mapStyle)));
 
     const blob = new Blob([tokenStyle], {type: "application/json;charset=utf-8"});
     saveAs(blob, this.props.mapStyle.id + ".json");
@@ -280,6 +280,12 @@ class ExportModal extends React.Component {
               onChange={this.changeMetadataProperty.bind(this, "maputnik:mapbox_access_token")}
             />
           </InputBlock>
+          <InputBlock label={"Thunderforest Access Token: "}>
+            <StringInput
+              value={(this.props.mapStyle.metadata || {})['maputnik:thunderforest_access_token']}
+              onChange={this.changeMetadataProperty.bind(this, "maputnik:thunderforest_access_token")}
+            />
+          </InputBlock>
         </p>
 
         <Button onClick={this.downloadStyle.bind(this)}>
diff --git a/src/components/modals/SettingsModal.jsx b/src/components/modals/SettingsModal.jsx
index 3f8790dc..b7da0a11 100644
--- a/src/components/modals/SettingsModal.jsx
+++ b/src/components/modals/SettingsModal.jsx
@@ -94,6 +94,14 @@ class SettingsModal extends React.Component {
         />
       </InputBlock>
 
+      <InputBlock label={"Thunderforest Access Token"} doc={"Public access token for Thunderforest services."}>
+        <StringInput {...inputProps}
+          data-wd-key="modal-settings.maputnik:thunderforest_access_token" 
+          value={metadata['maputnik:thunderforest_access_token']}
+          onChange={this.changeMetadataProperty.bind(this, "maputnik:thunderforest_access_token")}
+        />
+      </InputBlock>
+
       <InputBlock label={"Style Renderer"} doc={"Choose the default Maputnik renderer for this style."}>
         <SelectInput {...inputProps}
           data-wd-key="modal-settings.maputnik:renderer" 
diff --git a/src/components/modals/SourcesModal.jsx b/src/components/modals/SourcesModal.jsx
index c19a7b0b..b4b4e906 100644
--- a/src/components/modals/SourcesModal.jsx
+++ b/src/components/modals/SourcesModal.jsx
@@ -236,9 +236,12 @@ class SourcesModal extends React.Component {
         <p>
           Add one of the publicly available sources to your style.
         </p>
-        <div style={{maxwidth: 500}}>
+        <div className="maputnik-public-sources" style={{maxwidth: 500}}>
         {tilesetOptions}
         </div>
+        <p>
+          <strong>Note:</strong> Some of the tilesets are not optimised for online use, and as a result the file sizes of the tiles can be quite large (heavy) for online vector rendering. Please review any tilesets before use.
+        </p>
       </div>
 
       <div className="maputnik-modal-section">
diff --git a/src/config/tilesets.json b/src/config/tilesets.json
index ee321ce5..136963e1 100644
--- a/src/config/tilesets.json
+++ b/src/config/tilesets.json
@@ -8,5 +8,15 @@
     "type": "vector",
     "url": "https://free.tilehosting.com/data/v3.json?key={key}",
     "title": "OpenMapTiles"
+  },
+  "thunderforest_transport": {
+    "type": "vector",
+    "url": "https://tile.thunderforest.com/thunderforest.transport-v1.json?apikey={key}",
+    "title": "Thunderforest Transport (heavy)"
+  },
+  "thunderforest_outdoors": {
+    "type": "vector",
+    "url": "https://tile.thunderforest.com/thunderforest.outdoors-v1.json?apikey={key}",
+    "title": "Thunderforest Outdoors (heavy)"
   }
 }
diff --git a/src/config/tokens.json b/src/config/tokens.json
index 9676c74e..d08e6383 100644
--- a/src/config/tokens.json
+++ b/src/config/tokens.json
@@ -1,4 +1,5 @@
 {
   "mapbox": "pk.eyJ1IjoibW9yZ2Vua2FmZmVlIiwiYSI6ImNpeHJmNXNmZTAwNHIycXBid2NqdTJibjMifQ.Dv1-GDpTWi0NP6xW9Fct1w",
-  "openmaptiles": "Og58UhhtiiTaLVlPtPgs"
+  "openmaptiles": "Og58UhhtiiTaLVlPtPgs",
+  "thunderforest": "b71f7f0ba4064f5eb9e903859a9cf5c6"
 }
diff --git a/src/libs/style.js b/src/libs/style.js
index 0e786529..b867148d 100644
--- a/src/libs/style.js
+++ b/src/libs/style.js
@@ -54,18 +54,28 @@ function indexOfLayer(layers, layerId) {
   return null
 }
 
-function replaceAccessToken(mapStyle, opts={}) {
-  const omtSource = mapStyle.sources.openmaptiles
-  if(!omtSource) return mapStyle
-  if(!omtSource.hasOwnProperty("url")) return mapStyle
+function getAccessToken(key, mapStyle, opts) {
+  if(key === "thunderforest_transport" || key === "thunderforest_outdoors") {
+    key = "thunderforest";
+  }
 
   const metadata = mapStyle.metadata || {}
-  let accessToken = metadata['maputnik:openmaptiles_access_token'];
+  let accessToken = metadata['maputnik:'+key+'_access_token'];
 
   if(opts.allowFallback && !accessToken) {
-    accessToken = tokens.openmaptiles;
+    accessToken = tokens[key];
   }
 
+  return accessToken;
+}
+
+function replaceSourceAccessToken(mapStyle, key, opts={}) {
+  const source = mapStyle.sources[key]
+  if(!source) return mapStyle
+  if(!source.hasOwnProperty("url")) return mapStyle
+
+  const accessToken = getAccessToken(key, mapStyle, opts)
+
   if(!accessToken) {
     // Early exit.
     return mapStyle;
@@ -73,24 +83,40 @@ function replaceAccessToken(mapStyle, opts={}) {
 
   const changedSources = {
     ...mapStyle.sources,
-    openmaptiles: {
-      ...omtSource,
-      url: omtSource.url.replace('{key}', accessToken)
+    [key]: {
+      ...source,
+      url: source.url.replace('{key}', accessToken)
     }
   }
   const changedStyle = {
     ...mapStyle,
-    glyphs: mapStyle.glyphs ? mapStyle.glyphs.replace('{key}', accessToken) : mapStyle.glyphs,
     sources: changedSources
   }
 
   return changedStyle
 }
 
+function replaceAccessTokens(mapStyle, opts={}) {
+  let changedStyle = mapStyle;
+
+  Object.keys(mapStyle.sources).forEach((tokenKey) => {
+    changedStyle = replaceSourceAccessToken(changedStyle, tokenKey, opts);
+  })
+
+  if(mapStyle.glyphs && mapStyle.glyphs.match(/\.tileserver\.org/)) {
+    changedStyle = {
+      ...changedStyle,
+      glyphs: mapStyle.glyphs ? mapStyle.glyphs.replace('{key}', getAccessToken("openmaptiles", mapStyle, opts)) : mapStyle.glyphs
+    }
+  }
+
+  return changedStyle
+}
+
 export default {
   ensureStyleValidity,
   emptyStyle,
   indexOfLayer,
   generateId,
-  replaceAccessToken,
+  replaceAccessTokens,
 }
diff --git a/src/styles/_modal.scss b/src/styles/_modal.scss
index b54f7d1c..deada7f1 100644
--- a/src/styles/_modal.scss
+++ b/src/styles/_modal.scss
@@ -125,6 +125,10 @@
 }
 
 //SOURCE MODAL
+.maputnik-public-sources {
+  margin-bottom: 1.5%;
+}
+
 .maputnik-public-source {
   vertical-align: top;
   margin-top: 1.5%;
@@ -150,6 +154,7 @@
 
 .maputnik-public-source-id {
   font-weight: 400;
+  text-align: left;
 }
 
 .maputnik-active-source-type-editor {