New grf problem

[Whalker]

Hi.
I tryed to add some new train sets and vehicals. But when i´m in the game and wan´t to by a ore truck for example, there is only busses. Nothing els. When i inacctivate the sets, all the original is back and working. What i´m i doing wrong?

[TimeLapse1357]

your starting year may be before those vehicles become available. set starting year to 1970 or later.

[kamnet]

What NewGRF sets are you using?