Keep the ticket confirmation, proof of payment and the transport conditions available when buying. For an online purchase, this includes the order page, email and information visible at that time. For a purchase at the station, a photograph of the notice and a brief note of the conversation may be important.
Record the equipment, its condition and whether it was available at the entrance. Photograph station notices without interfering with safe operation. Where possible, identify the staff member involved and record possible witnesses.
Finally, set out the use: did the ride take place, when did it start, was an alternative offered and what was paid? This chronology supports a separate assessment of the safety decision, service and fare.