I'm on the train from Bracknell to Feltham. Travelling by train is good.
I'm on the bus from Feltham to Heathrow. Bus journeys are fun.
I'm flying from Heathrow to Dublin.
I'm on the bus from Dublin Airport to Connolly Station. I enjoy going by bus.
I'm on the train from Connolly to Maynooth. Trains are very pleasant.
I'm walking from the station to the hotel. I like walking, it's nice.
See if you can work out why the parallel sentence structures broke down in the middle of that journey.