Who killed Conductor Baker?

Easy, 4 clues

4 people were in the building, and one of them did not come out. Everyone was on a different square, one to a row and one to a column, on the 4 by 4 plan. Work out where each of them was, the victim included. Whoever was alone with the victim did it.

Stand or sit onbunk bedbench

Only besidesamovarticket booth

Tap a square or drag Max. Hold for a note.

MaxHe was in the dining car, beside the window.

The cards

Pick a person by tapping the photo on their card, the victim too. Then tap a square to put them there, or drag the photo onto it. Their row and column are crossed off for you. Holding a square, or switching the pencil on, makes a note. Keyboard: Enter places, Shift and Enter makes a note.

MaxSelected
He was in the dining car, beside the window.
Erin
She was in a corner of the station platform.
Nell
She was sitting on a bunk bed.
Conductor Baker
The victim. He was on the one square nobody else can have, in the same room as the murderer.

Good to know

Beside: on one of the four squares directly above, below, left or right, in the same room. Diagonally does not count, and neither does through a wall. A window or door in the wall of your square is beside you.
In a corner: on a square of that room where two of its walls meet. The end of a narrow corridor counts too.

0 of 4 placed

Place everyone first, the victim too.