How can I get past the grate?

Hint 1 of 7:

The grate can't be raised from the railroad track.

Hint 2 of 7:

You must go to the room where the baby is working.

Hint 3 of 7:

Block the sliding plate up with something in the upper hole.

Hint 4 of 7:

Use the umbrella to block the plate, and start when the plate is still down.

Hint 5 of 7:

Go through the opening to check on the grate.

Hint 6 of 7:

The controls to work it are in the outer room.