This is my first post on this forum so apologies in advance if I make any rookie mistakes. Feel free to point any out and I'll try to rectify them. I have a monthly zone 1-6 travelcard and every Wednesday between about 7-7:30pm I catch the train from London Paddington to Reading (I usually board a fast, non-stopping train). I always purchase a boundary zone 6 to Reading extension from the ticket booth (which is £11.10 for a peak ticket) but the problem is the station is very busy at this time and the queue is very long. I know it's not possible to purchase boundary zone tickets from the ticket machines, but I was wondering if it is possible for me to purchase a West Drayton to Reading ticket from the ticket machine and would this be valid for my journey? The same goes for the return leg. Am I OK to purchase a Reading to West Drayton ticket?