We bought tickets for train journeys at the station ticket office and paid by cash. There were no credit cards. I don't know whether some people paid by cheque, but I do know that it seemed very hit and miss whether shop keepers would accept cheques.
We had to allow plenty of time for buying tickets because we couldn't predict how long the queue would be at the ticket office. They couldn't be bought in advance.
The ticket office at my local station kept pre-printed single and return tickets for most popular destinations in top-fed bottom-dispensed vertical stacks. There was date stamp used to frank the back side of ticket, both ends for a return.
The date stamp for dating the tickets made a sort of 'thunper- thumper' sound.
Tickets for ordinary travel were small and made of thick, rough paper. The ones I remember were pale green. Return tickets were the same size and had to be torn in half with one half for the outward journey and the other half for the return journey.
As far as I remember there were stacks of them within easy reach of the booking clerk who was selling them. All he had to do was to reach for the appropriate ticket, date it, hand it over and take the money. Tickets were not specially printed for each journey.
Tickets to get onto a platform to see people off were known as 'platform tickets'.
Although platform tickets could be bought at the ticket office, there were also machines which sold them. They always seemed to cost a penny (in old money), as did a visit to a public lavatory.
Most workers - including my father once he was back from the war - bought season tickets which worked out cheaper for making the same journey every working day. Working from home was very rare indeed.
Season tickets were larger than tickets for single journeys, about the size of a modern credit card.
As a child in the 1940s, I remember women talking about their men on leave from the war having a 'travel warrant', but I was too young to pay much attention. Fortunately Alan Bennett has provided a separate page on travel warrants.
Were any other types of personnel, apart from members of the forces, issued with special train tickets?