Hi,
Add this to the config of the item:
height-range -50,10
This will make you be able to move the item from a range of 50 meter below the ground to up to 10 meter above the ground.
Or, use any other number you want.
Then, raise the ground as you want it, and lowering the bin again till you get the look you want.
This is a little more work, but the best we can do until Auran decide it is time for a object lock inside of Trainz so a object can be locked along the 3 axis making up our virtual world.
Until that day, all scenic objects will always follow the ground, and the best we can do is adding that line to objects that don't have it and try to lower/raise the objects when we changes the ground till we end up with a result we can live with.
Hope this helps a little?
Best of luck & wishes
Linda