Galen stoller was killed at a railroad crossing when a train hit his car. the crossing was marked with a stop sign and a railroad-crossing symbol. the sign was not obstructed by vegetation, but there were no flashing lights. galen’s parents filed a suit against burlington northern & santa fe railroad corp. the plaintiffs accused the defendant of negligence in the design and maintenance of the crossing. the defendant argued that galen had not stopped at the stop sign. was the railroad negligent? what was the proximate cause of the accident? discuss.