Paddington (every 7½ mins)

Heathrow T4 (every 15 mins)

Maidenhead (every 30 mins)

Reading (every 30 mins)

Paddington (every 4 mins)

Heathrow T4 (every 15 mins)

West Drayton (every 30 mins)

Maidenhead (every 30 mins)

Reading (every 30 mins)