If EVA needed to get on the roof of the train, she'd either have to wait until they were out of the narrow tunnel, or she'd have to crawl carefully in the dark. Hopefully she'd be able to get to the middle of the train entirely from the inside instead.

"Sounds fine." She paused for a second. "Do you have MK-II with you, Raiden?"

MK-II was there to help open doors. If Raiden had the robot, EVA discerned she might have a little bit of trouble with the doors...