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Unlike ways and bridges, tunnels require few images. They are always composed of backimage (images displayed behind passing vehicles) and frontimage (images displayed before the vehicles). Here is the pattern:
Tunnels can have snowy images. To define them, a parameter must be added to the name of each image, equal to 0 for normal (summer) view and 1 for snowy (winter) view. Here is an example:
| Parameter | Description | Content | Example |
| obj | object type | tunnel | |
| waytype | way type | internal_name | maglev_track |
| name | name | texte | AMT_tunnel_1 |
| cost | price (*100c) | number | 300000 |
| maintenance | maintenance cost (*100c) | number | 8000 |
| topspeed | max speed (km/h) | number | 750 |
| intro_year | introduction year | number | 2025 |
| intro_month | introduction month | number | 1 |
| way | way whose graphics are used for the underground tunnel | name | AMT |
| copyright | name of the creator | text | Gauthier |
