Heres a screenie of the grounds that are causing problems.
The complete cycle is green field, brown field and yellow field. The cycle repeats itself. Each field colour is made of of 4 sections of ground, each 25m long.
Heres a chunk of codes for the ground,
.Ground(18) Ongar BVE4\scenery\Essex Fields\field_tree_1.csv
.Ground(19) Ongar BVE4\scenery\Essex Fields\field_tree_2.csv
.Ground(20) Ongar BVE4\scenery\Essex Fields\field_tree_3.csv
.Ground(21) Ongar BVE4\scenery\Essex Fields\field_tree_4.csv
.Ground(22) Ongar BVE4\scenery\Essex Fields\b_field_tree_1.csv
.Ground(23) Ongar BVE4\scenery\Essex Fields\b_field_tree_2.csv
.Ground(24) Ongar BVE4\scenery\Essex Fields\b_field_tree_3.csv
.Ground(25) Ongar BVE4\scenery\Essex Fields\b_field_tree_4.csv
.Ground(26) Ongar BVE4\scenery\Essex Fields\y_field_tree_1.csv
.Ground(27) Ongar BVE4\scenery\Essex Fields\y_field_tree_2.csv
.Ground(28) Ongar BVE4\scenery\Essex Fields\y_field_tree_3.csv
.Ground(29) Ongar BVE4\scenery\Essex Fields\y_field_tree_4.csv
With Cycle
.Ground(30) 18;19;20;21;22;23;24;25;26;27;28;29,
The grounds are all in 256 colours, no 24 bit images. The trees objects are from the routebuilder's library which is merged with the ground file. The other face were taken out and a few trees discarded.