We then headed north to the border, which was marked by a stone and a stop sign.
We crossed the border, entered the woods
and walked to Hegenheim.
.
From here we caught the bus to St Louis.
Journey time of two hours.
Conclusion
If you were travelling by train from Switerland to France,
then leaving the train at Basel, walking over the border
and rejoining the train in St Louis this would only add
approximately 2 hours to your journey.