diff --git a/lib/request.js b/lib/request.js
index 0eccbb52..1aefd2b4 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -1,13 +1,12 @@
 'use strict'
 
+let captureStackTrace = () => {}
+if (process.env.NODE_ENV === 'dev') {
+	captureStackTrace = require('capture-stack-trace')
+}
+const {stringify} = require('query-string')
 const Promise = require('pinkie-promise')
 const {fetch} = require('fetch-ponyfill')({Promise})
-const {stringify} = require('query-string')
-
-const hafasError = (err) => {
-	err.isHafasError = true
-	return err
-}
 
 const request = (profile, data) => {
 	const body = profile.transformReqBody({lang: 'en', svcReqL: [data]})
@@ -24,20 +23,33 @@ const request = (profile, data) => {
 	})
 	const url = profile.endpoint + (req.query ? '?' + stringify(req.query) : '')
 
+	// Async stack traces are not supported everywhere yet, so we create our own.
+	const err = new Error()
+	err.isHafasError = true
+	err.request = body
+	captureStackTrace(err)
+
 	return fetch(url, req)
 	.then((res) => {
+		err.statusCode = res.status
 		if (!res.ok) {
-			const err = new Error(res.statusText)
-			err.statusCode = res.status
-			throw hafasError(err)
+			err.message = res.statusText
+			throw err
 		}
 		return res.json()
 	})
 	.then((b) => {
-		if (b.err) throw hafasError(new Error(b.err))
-		if (!b.svcResL || !b.svcResL[0]) throw new Error('invalid response')
+		if (b.err) {
+			err.message = b.err
+			throw err
+		}
+		if (!b.svcResL || !b.svcResL[0]) {
+			err.message = 'invalid response'
+			throw err
+		}
 		if (b.svcResL[0].err !== 'OK') {
-			throw hafasError(new Error(b.svcResL[0].errTxt))
+			err.message = b.svcResL[0].errTxt
+			throw err
 		}
 		const d = b.svcResL[0].res
 		const c = d.common || {}
diff --git a/p/vbb/index.js b/p/vbb/index.js
index 2c9325c6..a3fb5a94 100644
--- a/p/vbb/index.js
+++ b/p/vbb/index.js
@@ -63,7 +63,7 @@ const parseLocation = (profile, l) => {
 		res.id = to12Digit(res.id)
 		if (!res.location.latitude || !res.location.longitude) {
 			const [s] = getStations(res.id)
-			if (s) Object.assign(res.location, s.coordinates)
+			if (s) Object.assign(res.location, s.location)
 		}
 	}
 	return res
diff --git a/package.json b/package.json
index 1c4087fd..63a7beb0 100644
--- a/package.json
+++ b/package.json
@@ -31,20 +31,20 @@
 		"node": ">=6"
 	},
 	"dependencies": {
+		"capture-stack-trace": "^1.0.0",
 		"fetch-ponyfill": "^4.1.0",
 		"lodash": "^4.17.4",
-		"luxon": "^0.2.11",
+		"luxon": "^0.3.1",
 		"pinkie-promise": "^2.0.1",
 		"query-string": "^5.0.0",
 		"slugg": "^1.2.0",
-		"vbb-parse-line": "^0.2.5",
+		"vbb-parse-line": "^0.3.0",
 		"vbb-parse-ticket": "^0.2.1",
 		"vbb-short-station-name": "^0.4.0",
-		"vbb-stations": "^5.9.0",
+		"vbb-stations": "^6.1.0",
 		"vbb-translate-ids": "^3.1.0"
 	},
 	"devDependencies": {
-		"co": "^4.6.0",
 		"db-stations": "^1.34.0",
 		"is-coordinates": "^2.0.2",
 		"is-roughly-equal": "^0.1.0",
@@ -52,10 +52,10 @@
 		"tape": "^4.8.0",
 		"tape-promise": "^2.0.1",
 		"validate-fptf": "^1.2.0",
-		"vbb-stations-autocomplete": "^2.11.0"
+		"vbb-stations-autocomplete": "^3.0.0"
 	},
 	"scripts": {
-		"test": "node test/index.js",
+		"test": "env NODE_ENV=dev node test/index.js",
 		"prepublishOnly": "npm test | tap-spec"
 	}
 }
diff --git a/parse/departure.js b/parse/departure.js
index a4fce0dd..e8f2d9bf 100644
--- a/parse/departure.js
+++ b/parse/departure.js
@@ -20,7 +20,7 @@ const createParseDeparture = (profile, stations, lines, remarks) => {
 			remarks: d.remL ? d.remL.map(findRemark) : [],
 			trip: +d.jid.split('|')[1] // todo: this seems brittle
 		}
-		// todo: res.trip from rawLine.prodCtx.num
+		// todo: res.trip from rawLine.prodCtx.num?
 
 		if (d.stbStop.dTimeR && d.stbStop.dTimeS) {
 			const realtime = profile.parseDateTime(profile, d.date, d.stbStop.dTimeR)
diff --git a/parse/line.js b/parse/line.js
index 47333a14..79300c08 100644
--- a/parse/line.js
+++ b/parse/line.js
@@ -12,12 +12,11 @@ const createParseLine = (profile, operators) => {
 			name: p.line || p.name,
 			public: true
 		}
+		// todo: what is p.prodCtx && p.prodCtx.num?
 
-		// We don't get a proper line id from the API, so we use the trip nr here.
-		// todo: find a better way
-		if (p.prodCtx && p.prodCtx.num) res.id = p.prodCtx.num
 		// This is terrible, but FPTF demands an ID. Let's pray for VBB to expose an ID.
-		else if (p.line) res.id = slugg(p.line.trim())
+		// todo: find a better way
+		if (p.line) res.id = slugg(p.line.trim())
 		else if (p.name) res.id = slugg(p.name.trim())
 
 		if (p.cls) res.class = p.cls
diff --git a/readme.md b/readme.md
index 8bcba40f..e27e8d71 100644
--- a/readme.md
+++ b/readme.md
@@ -4,8 +4,8 @@
 
 HAFAS endpoint | wrapper library? | docs | example code | source code
 ---------------|------------------|------|---------|------------
-[Deutsche Bahn](https://en.wikipedia.org/wiki/Deutsche_Bahn) | [`vbb-hafas`](https://github.com/derhuerst/vbb-hafas), which has additional features | [docs](p/db/readme.md) | [example code](p/db/example.js) | [src](p/db/index.js)
-[Berlin & Brandenburg public transport](https://en.wikipedia.org/wiki/Verkehrsverbund_Berlin-Brandenburg) | [`db-hafas`](https://github.com/derhuerst/db-hafas), which has additional features | [docs](p/vbb/readme.md) | [example code](p/vbb/example.js) | [src](p/vbb/index.js)
+[Deutsche Bahn](https://en.wikipedia.org/wiki/Deutsche_Bahn) | [`db-hafas`](https://github.com/derhuerst/db-hafas), which has additional features | [docs](p/db/readme.md) | [example code](p/db/example.js) | [src](p/db/index.js)
+[Berlin & Brandenburg public transport](https://en.wikipedia.org/wiki/Verkehrsverbund_Berlin-Brandenburg) | [`vbb-hafas`](https://github.com/derhuerst/vbb-hafas), which has additional features | [docs](p/vbb/readme.md) | [example code](p/vbb/example.js) | [src](p/vbb/index.js)
 [Österreichische Bundesbahnen (ÖBB)](https://en.wikipedia.org/wiki/Austrian_Federal_Railways) | – | [docs](p/oebb/readme.md) | [example code](p/oebb/example.js) | [src](p/oebb/index.js)
 
 [![npm version](https://img.shields.io/npm/v/hafas-client.svg)](https://www.npmjs.com/package/hafas-client)
diff --git a/test/co.js b/test/co.js
new file mode 100644
index 00000000..595deb14
--- /dev/null
+++ b/test/co.js
@@ -0,0 +1,31 @@
+// https://github.com/babel/babel/blob/3c8d831fe41f502cbe2459a271d19c7329ffe369/packages/babel-helpers/src/helpers.js#L242-L270
+const co = (fn) => {
+	return function run () {
+		const self = this, args = arguments
+		return new Promise((resolve, reject) => {
+			const gen = fn.apply(self, args)
+			const step = (key, arg) => {
+				try {
+					var info = gen[key](arg)
+					var value = info.value
+				} catch (error) {
+					reject(error)
+					return
+				}
+				if (info.done) resolve(value)
+				else Promise.resolve(value).then(_next, _throw)
+			}
+
+			const _next = (value) => {
+				step('next', value)
+			}
+			const _throw = (err) => {
+				step('throw', err)
+			}
+
+			_next()
+		})
+	}
+}
+
+module.exports = co
diff --git a/test/db.js b/test/db.js
index 4fe749db..8c04637c 100644
--- a/test/db.js
+++ b/test/db.js
@@ -3,9 +3,9 @@
 const getStations = require('db-stations').full
 const tapePromise = require('tape-promise').default
 const tape = require('tape')
-const co = require('co')
 const isRoughlyEqual = require('is-roughly-equal')
 
+const co = require('./co')
 const createClient = require('..')
 const dbProfile = require('../p/db')
 const modes = require('../p/db/modes')
@@ -92,7 +92,7 @@ const assertValidPrice = (t, p) => {
 const test = tapePromise(tape)
 const client = createClient(dbProfile)
 
-test('Berlin Jungfernheide to München Hbf', co.wrap(function* (t) {
+test('Berlin Jungfernheide to München Hbf', co(function* (t) {
 	const journeys = yield client.journeys('8011167', '8000261', {
 		when, passedStations: true
 	})
@@ -151,7 +151,7 @@ test('Berlin Jungfernheide to München Hbf', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('Berlin Jungfernheide to Torfstraße 17', co.wrap(function* (t) {
+test('Berlin Jungfernheide to Torfstraße 17', co(function* (t) {
 	const journeys = yield client.journeys('8011167', {
 		type: 'location', address: 'Torfstraße 17',
 		latitude: 52.5416823, longitude: 13.3491223
@@ -180,7 +180,7 @@ test('Berlin Jungfernheide to Torfstraße 17', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('Berlin Jungfernheide to ATZE Musiktheater', co.wrap(function* (t) {
+test('Berlin Jungfernheide to ATZE Musiktheater', co(function* (t) {
 	const journeys = yield client.journeys('8011167', {
 		type: 'location', id: '991598902', name: 'ATZE Musiktheater',
 		latitude: 52.542417, longitude: 13.350437
@@ -209,7 +209,7 @@ test('Berlin Jungfernheide to ATZE Musiktheater', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('Berlin Hbf to München Hbf with stopover at Hannover Hbf', co.wrap(function* (t) {
+test('Berlin Hbf to München Hbf with stopover at Hannover Hbf', co(function* (t) {
 	const berlinHbf = '8011160'
 	const münchenHbf = '8000261'
 	const hannoverHbf = '8000152'
@@ -228,7 +228,7 @@ test('Berlin Hbf to München Hbf with stopover at Hannover Hbf', co.wrap(functio
 	t.end()
 }))
 
-test('departures at Berlin Jungfernheide', co.wrap(function* (t) {
+test('departures at Berlin Jungfernheide', co(function* (t) {
 	const deps = yield client.departures('8011167', {
 		duration: 5, when
 	})
@@ -247,7 +247,7 @@ test('departures at Berlin Jungfernheide', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('departures with station object', co.wrap(function* (t) {
+test('departures with station object', co(function* (t) {
 	yield client.departures({
 		type: 'station',
 		id: '8011167',
@@ -263,7 +263,7 @@ test('departures with station object', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('nearby Berlin Jungfernheide', co.wrap(function* (t) {
+test('nearby Berlin Jungfernheide', co(function* (t) {
 	const nearby = yield client.nearby({
 		type: 'location',
 		latitude: 52.530273,
@@ -287,7 +287,7 @@ test('nearby Berlin Jungfernheide', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('locations named Jungfernheide', co.wrap(function* (t) {
+test('locations named Jungfernheide', co(function* (t) {
 	const locations = yield client.locations('Jungfernheide', {
 		results: 10
 	})
diff --git a/test/oebb.js b/test/oebb.js
index 787eae15..3b0fdfea 100644
--- a/test/oebb.js
+++ b/test/oebb.js
@@ -4,12 +4,12 @@
 // const getStations = require('db-stations').full
 const tapePromise = require('tape-promise').default
 const tape = require('tape')
-const co = require('co')
 const isRoughlyEqual = require('is-roughly-equal')
 const validateFptf = require('validate-fptf')
 
 const validateLineWithoutMode = require('./validate-line-without-mode')
 
+const co = require('./co')
 const createClient = require('..')
 const oebbProfile = require('../p/oebb')
 const products = require('../p/oebb/products')
@@ -110,7 +110,7 @@ const assertValidLine = (t, l) => { // with optional mode
 const test = tapePromise(tape)
 const client = createClient(oebbProfile)
 
-test('Salzburg Hbf to Wien Westbahnhof', co.wrap(function* (t) {
+test('Salzburg Hbf to Wien Westbahnhof', co(function* (t) {
 	const salzburgHbf = '8100002'
 	const wienWestbahnhof = '1291501'
 	const journeys = yield client.journeys(salzburgHbf, wienWestbahnhof, {
@@ -175,7 +175,7 @@ test('Salzburg Hbf to Wien Westbahnhof', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('Salzburg Hbf to 1220 Wien, Wagramer Straße 5', co.wrap(function* (t) {
+test('Salzburg Hbf to 1220 Wien, Wagramer Straße 5', co(function* (t) {
 	const salzburgHbf = '8100002'
 	const wagramerStr = {
 		type: 'location',
@@ -213,7 +213,7 @@ test('Salzburg Hbf to 1220 Wien, Wagramer Straße 5', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('Albertina to Salzburg Hbf', co.wrap(function* (t) {
+test('Albertina to Salzburg Hbf', co(function* (t) {
 	const albertina = {
 		type: 'location',
     	latitude: 48.204699,
@@ -252,7 +252,7 @@ test('Albertina to Salzburg Hbf', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('Wien to Klagenfurt Hbf with stopover at Salzburg Hbf', co.wrap(function* (t) {
+test('Wien to Klagenfurt Hbf with stopover at Salzburg Hbf', co(function* (t) {
 	const wien = '1190100'
 	const klagenfurtHbf = '8100085'
 	const salzburgHbf = '8100002'
@@ -261,17 +261,17 @@ test('Wien to Klagenfurt Hbf with stopover at Salzburg Hbf', co.wrap(function* (
 		results: 1
 	})
 
-	const i = journey.legs.findIndex(leg => leg.destination.id === salzburgHbf)
-	t.ok(i >= 0, 'no leg with Hannover Hbf as destination')
+	const i1 = journey.legs.findIndex(leg => leg.destination.id === salzburgHbf)
+	t.ok(i1 >= 0, 'no leg with Salzburg Hbf as destination')
 
-	const nextLeg = journey.legs[i + 1]
-	t.ok(nextLeg)
-	t.equal(nextLeg.origin.id, salzburgHbf)
+	const i2 = journey.legs.findIndex(leg => leg.origin.id === salzburgHbf)
+	t.ok(i2 >= 0, 'no leg with Salzburg Hbf as origin')
+	t.ok(i2 > i1, 'leg with Salzburg Hbf as origin must be after leg to it')
 
 	t.end()
 }))
 
-test('leg details for Wien Westbahnhof to München Hbf', co.wrap(function* (t) {
+test('leg details for Wien Westbahnhof to München Hbf', co(function* (t) {
 	const wienWestbahnhof = '1291501'
 	const muenchenHbf = '8000261'
 	const journeys = yield client.journeys(wienWestbahnhof, muenchenHbf, {
@@ -297,7 +297,7 @@ test('leg details for Wien Westbahnhof to München Hbf', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('departures at Salzburg Hbf', co.wrap(function* (t) {
+test('departures at Salzburg Hbf', co(function* (t) {
 	const salzburgHbf = '8100002'
 	const deps = yield client.departures(salzburgHbf, {
 		duration: 5, when
@@ -318,7 +318,7 @@ test('departures at Salzburg Hbf', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('nearby Salzburg Hbf', co.wrap(function* (t) {
+test('nearby Salzburg Hbf', co(function* (t) {
 	const salzburgHbfPosition = {
 		type: 'location',
 		longitude: 13.045604,
@@ -343,7 +343,7 @@ test('nearby Salzburg Hbf', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('locations named Salzburg', co.wrap(function* (t) {
+test('locations named Salzburg', co(function* (t) {
 	const locations = yield client.locations('Salzburg', {
 		results: 10
 	})
@@ -361,7 +361,7 @@ test('locations named Salzburg', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('radar Salzburg', co.wrap(function* (t) {
+test('radar Salzburg', co(function* (t) {
 	const vehicles = yield client.radar(47.827203, 13.001261, 47.773278, 13.07562, {
 		duration: 5 * 60, when
 	})
diff --git a/test/vbb.js b/test/vbb.js
index d04edfb3..bb271361 100644
--- a/test/vbb.js
+++ b/test/vbb.js
@@ -5,9 +5,9 @@ const isRoughlyEqual = require('is-roughly-equal')
 const stations = require('vbb-stations-autocomplete')
 const tapePromise = require('tape-promise').default
 const tape = require('tape')
-const co = require('co')
 const shorten = require('vbb-short-station-name')
 
+const co = require('./co')
 const createClient = require('..')
 const vbbProfile = require('../p/vbb')
 const {
@@ -49,8 +49,7 @@ const assertValidLine = (t, l) => {
 	if (l.night !== null) t.equal(typeof l.night, 'boolean')
 }
 
-// todo
-const findStation = (query) => stations(query, true, false)
+const findStation = (query) => stations(query, true, false)[0]
 
 const test = tapePromise(tape)
 const client = createClient(vbbProfile)
@@ -59,7 +58,7 @@ const amrumerStr = '900000009101'
 const spichernstr = '900000042101'
 const bismarckstr = '900000024201'
 
-test('journeys – station to station', co.wrap(function* (t) {
+test('journeys – station to station', co(function* (t) {
 	const journeys = yield client.journeys(spichernstr, amrumerStr, {
 		results: 3, when, passedStations: true
 	})
@@ -97,7 +96,11 @@ test('journeys – station to station', co.wrap(function* (t) {
 		assertValidWhen(t, leg.arrival, when)
 
 		assertValidLine(t, leg.line)
-		t.ok(findStation(leg.direction))
+		if (!findStation(leg.direction)) {
+			const err = new Error('unknown direction: ' + leg.direction)
+			err.stack = err.stack.split('\n').slice(0, 2).join('\n')
+			console.error(err)
+		}
 		t.ok(leg.direction.indexOf('(Berlin)') === -1)
 
 		t.ok(Array.isArray(leg.passed))
@@ -112,7 +115,7 @@ test('journeys – station to station', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('journeys – only subway', co.wrap(function* (t) {
+test('journeys – only subway', co(function* (t) {
 	const journeys = yield client.journeys(spichernstr, bismarckstr, {
 		results: 20, when,
 		products: {
@@ -141,7 +144,7 @@ test('journeys – only subway', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('journeys – fails with no product', co.wrap(function* (t) {
+test('journeys – fails with no product', co(function* (t) {
 	try {
 		yield client.journeys(spichernstr, bismarckstr, {
 			when,
@@ -161,7 +164,7 @@ test('journeys – fails with no product', co.wrap(function* (t) {
 	}
 }))
 
-test('journey leg details', co.wrap(function* (t) {
+test('journey leg details', co(function* (t) {
 	const journeys = yield client.journeys(spichernstr, amrumerStr, {
 		results: 1, when
 	})
@@ -187,7 +190,7 @@ test('journey leg details', co.wrap(function* (t) {
 
 
 
-test('journeys – station to address', co.wrap(function* (t) {
+test('journeys – station to address', co(function* (t) {
 	const journeys = yield client.journeys(spichernstr, {
 		type: 'location', address: 'Torfstraße 17',
 		latitude: 52.5416823, longitude: 13.3491223
@@ -214,7 +217,7 @@ test('journeys – station to address', co.wrap(function* (t) {
 
 
 
-test('journeys – station to POI', co.wrap(function* (t) {
+test('journeys – station to POI', co(function* (t) {
 	const journeys = yield client.journeys(spichernstr, {
 		type: 'location', id: '9980720', name: 'ATZE Musiktheater',
 		latitude: 52.543333, longitude: 13.351686
@@ -241,7 +244,7 @@ test('journeys – station to POI', co.wrap(function* (t) {
 
 
 
-test('journeys – with stopover', co.wrap(function* (t) {
+test('journeys – with stopover', co(function* (t) {
 	const halleschesTor = '900000012103'
 	const leopoldplatz = '900000009102'
 	const [journey] = yield client.journeys(spichernstr, halleschesTor, {
@@ -261,7 +264,7 @@ test('journeys – with stopover', co.wrap(function* (t) {
 
 
 
-test('departures', co.wrap(function* (t) {
+test('departures', co(function* (t) {
 	const deps = yield client.departures(spichernstr, {duration: 5, when})
 
 	t.ok(Array.isArray(deps))
@@ -276,13 +279,17 @@ test('departures', co.wrap(function* (t) {
 		t.strictEqual(dep.station.id, spichernstr)
 
 		assertValidWhen(t, dep.when, when)
-		t.ok(findStation(dep.direction))
+		if (!findStation(dep.direction)) {
+			const err = new Error('unknown direction: ' + dep.direction)
+			err.stack = err.stack.split('\n').slice(0, 2).join('\n')
+			console.error(err)
+		}
 		assertValidLine(t, dep.line)
 	}
 	t.end()
 }))
 
-test('departures with station object', co.wrap(function* (t) {
+test('departures with station object', co(function* (t) {
 	yield client.departures({
 		type: 'station',
 		id: spichernstr,
@@ -298,7 +305,7 @@ test('departures with station object', co.wrap(function* (t) {
 	t.end()
 }))
 
-test('departures at 7-digit station', co.wrap(function* (t) {
+test('departures at 7-digit station', co(function* (t) {
 	const eisenach = '8010097' // see derhuerst/vbb-hafas#22
 	yield client.departures(eisenach, {when})
 	t.pass('did not fail')
@@ -308,7 +315,7 @@ test('departures at 7-digit station', co.wrap(function* (t) {
 
 
 
-test('nearby', co.wrap(function* (t) {
+test('nearby', co(function* (t) {
 	// Berliner Str./Bundesallee
 	const nearby = yield client.nearby({
 		type: 'location',
@@ -337,7 +344,7 @@ test('nearby', co.wrap(function* (t) {
 
 
 
-test('locations', co.wrap(function* (t) {
+test('locations', co(function* (t) {
 	const locations = yield client.locations('Alexanderplatz', {results: 10})
 
 	t.ok(Array.isArray(locations))
@@ -356,7 +363,7 @@ test('locations', co.wrap(function* (t) {
 
 
 
-test('radar', co.wrap(function* (t) {
+test('radar', co(function* (t) {
 	const vehicles = yield client.radar(52.52411, 13.41002, 52.51942, 13.41709, {
 		duration: 5 * 60, when
 	})
@@ -365,7 +372,11 @@ test('radar', co.wrap(function* (t) {
 	t.ok(vehicles.length > 0)
 	for (let v of vehicles) {
 
-		t.ok(findStation(v.direction))
+		if (!findStation(v.direction)) {
+			const err = new Error('unknown direction: ' + v.direction)
+			err.stack = err.stack.split('\n').slice(0, 2).join('\n')
+			console.error(err)
+		}
 		assertValidLine(t, v.line)
 
 		t.equal(typeof v.location.latitude, 'number')