The ornamental design for a userinterface for a grade crossing predictor, as shown and described.
FIG. 1 is a perspective view of a first end of a user interface for a grade crossing predictor showing our new and ornamental design;
FIG. 2 is a front view of the user interface thereof;
FIG. 3 is a first side view thereof;
FIG. 4 is a second side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a view of the user interface within a grade crossing predictor.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.