Mine Cart Ramp

+-- Level +1 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Ground level ---+
|   ^               |
|   %               |
|   v               |
|                   |
+-------------------+

+-- Level -1 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -2 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -3 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -4 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -5 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -6 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -7 ---+
|   ^           |
|   %           |
|               |
+---------------+

+-- Level -8 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -9 ---+
|   ^           |
|   %           |
|   v           |
|               |
+---------------+

+-- Level -10 ---+
|   ^            |
|   %            |
|                |
+----------------+