CASTLE ROCK, Colo. -- Missy Martin, the Castle Rock high school student who was critically injured when a train slammed into her car two years ago, took the stand Friday in a civil trial to get Union Pacific to pay for injuries she suffered.

Martin, 19, said her life has changed dramatically since the accident and that she is a very different person now.

She has no recollection of the crash, and her injuries have left her frustrated and with few friends, she said. She is no longer close to her sisters.

Her medical expenses have already topped $600,000 and her future medical expenses have been estimated at $4.5 million. It's also estimated she will lose $2 million in future earnings, because of her injuries.

Martin's car stalled at a railroad crossing in Castle Rock on Nov. 12, 2002, and her boyfriend, who was driving behind her, tried in vain to push her out of the way as a Union Pacific train approached. The two were headed to school at the time.

The engineer of the train had earlier testified he saw her car inside the crossing area but thought the train would clear it and that the boyfriend's actions put her car in the train's path when it was no longer possible for the train to stop.

The accident left Martin in a coma for two months and inflicted permanent brain damage.

The Martin family claims that Union Pacific was responsible for the accident. They say the train was going too fast for the area and that the railroad crossing was unsafe.