Add additional colour schemes to RCT2 Mine Train

Author: orbifant

objects/rct2/ride/rct2.ride.amt1.json

@@ -31,6 +31,20 @@
                     "black",
                     "bordeaux_red"
                 ]
+            ],
+            [
+                [
+                    "saturated_brown",
+                    "light_brown",
+                    "black"
+                ]
+            ],
+            [
+                [
+                    "dark_green",
+                    "black",
+                    "black"
+                ]
             ]
         ],
         "cars": [