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Close circuit television coding scheme
| Code number | Code |
| Code 1 | Position of the person on the platform. |
| Code 2 | Were other people/potential bystanders present? |
| Code 3 | Did the person interact with others? |
| Code 4 | Behaviour/body language. |
| Code 5 | How many trains went by in both directions before each incident? |
| Code 6 | Comparison with other passengers’ behaviour. |
| Code 7 | Do other passengers appear to notice anything suspicious? |
