He had seen no light but that in the window through which he was staring.
The thought was scarcely born before he was at the platform door.

The latch clicked gently under his fingers; cautiously he pushed the door inward and thrust in his head and shoulders.

The air inside was cold and frosty.

He reached out an arm to the right and his hand encountered the rough-hewn surface of a wall; he advanced a step and reached out to the left.

There, too, his hand touched a wall.