Enke could have been with the team but for a recent intestinal infection, and Oliver Bierhoff, the national squad manager, summed it up, “We are too shocked to find words.”

Enke’s car, a Mercedes, was found near the crossing, unlocked and with his wallet on the passenger seat. The two train drivers saw a man on the track and applied the brakes, but at 160 kilometers an hour, or 100 miles an hour, it was too late to prevent the death.

The police said there was a suicide note, and German newspapers ran with two lines of commentary. One was that Enke, a quiet and reserved individual, was a troubled man ever since his biological daughter, Lara, died at the age of 2 in September 2006. She had a rare heart malformation. The other was the loneliness, the uncertainty, of a goalie’s situation.

On Wednesday afternoon, Teresa Enke said at a news conference attended by her husband’s psychologist that he was first treated in 2003. “When he was acutely depressive, he lacked motivation and hope,” she said. “I tried to be there for him. I said football is not everything, there are many beautiful things in life, it is not hopeless.”

The psychologist, Dr. Valentin Markser, said Enke had a fear of failure.

Enke had chosen as a boy to play in the most exposed position, the last line of defense, and the one first blamed when things go wrong. Born in Jena, in East Germany, he joined SV Jena Pharm in 1985, when he was 8.

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He moved to Carl Zeiss Jena the next year and had been moving on ever since.

There were three years at Borussia Mönchengladbach, three years in Portugal with Benfica, a squad that went through three coaching changes while he was there and had financial difficulties that resulted in players sometimes being paid late.

Enke’s counseling began when he moved to Barcelona. He was the eternal understudy there, the rising German keeper given just three opportunities with the first team. Barcelona thought highly of him, but lent him to Fenerbache of Istanbul, then to Tenerife. His Turkish misadventure lasted just one match, a loss after which Fenerbache fans bombarded him with firecrackers and missiles in their anger at losing.

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Finally, he found relative security at Hannover, where he stayed for five years despite offers to move to more glamorous clubs. He was the team captain, chosen in part by his fellow players. When Jens Lehmann retired from Germany’s national team after Euro 2008, Enke was expected to be entrusted with the jersey.

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It was not certain. In goalkeeping, more than any other position, you are only as good as your last mistake. Trust is between the coach and the last man standing, and that presupposes that the goalie has the style, the personality and the authority that defenders in front of him also like and trust.

Enke was being pressed by René Adler, the 24-year-old Leipzig-born goalkeeper. Enke had more experience, Adler has youth, greater height and reach, and the advantage of playing for Bayer Leverkusen, which currently leads Germany’s Bundesliga.

Joachim Löw, the coach, was thought to favor Enke for the 2010 World Cup. But of course no trainer would make such a promise to one goalie, because it would be too great a disincentive to the others.

It seems the professional uncertainty fed Enke’s anxiety. Illness and injury could not have helped. A year ago, shortly after Lehmann left the national squad, Enke lost two months to a broken bone in his hand.

In his final game for the German national team in August, he had a goalkeeper’s dream score, shutting out Azerbaijan. Then he contracted an intestinal virus that cost him another nine weeks. He had just returned to Hannover’s lineup.

The loneliness of a player sidelined for months, the exclusion from the team training and comradeship, are all part of the professional experience.

As fans laid wreaths and lighted candles at the gates of the stadium, Teresa Enke faced the news media there. She said: “He was scared of losing Leila if his depression came out. Now it is coming out anyway. We thought we could do everything with love, but you can’t always do it.”

And so along with his widow, a club and the national team also mourn for a man who took his own life near the peak of his sporting career.