SHANGHAI — Henry Cao has stark memories of the moment the high-speed train he was riding rear-ended another last summer in the eastern city of Wenzhou: the pleasantly hypnotic rocking that gave way to a jolt he likened to an earthquake, followed by blackness and the sensation of falling as the car plummeted 100 feet off a viaduct.

“We were flying like rag dolls,” he said.

The crash killed 40 passengers, injured 191 and shook the nation’s confidence in its ambitious high-speed rail system. Mr. Cao, 33, a Chinese-American importer from Colorado, barely survived; he lost a kidney and his spleen, and head injuries have left him mired in a perpetual daze, unable to stay awake for more than an hour or two. His parents, naturalized American citizens taking him on a triumphant tour of their native land, were killed.

As Mr. Cao has struggled to recover over the past year, he has found himself drained by a different sort of battle: trying to wrest compensation from the Ministry of Railways, an unbending government behemoth unaccustomed to dealing with determined foreign citizens.

This month Mr. Cao returned to China for the first time since the accident. He and his brother, Leo, came to collect their parents’ remains and to press negotiations with the ministry. “They know how to wear you down,” said Leo Cao, 30. “First they let you scream and yell, then they stall you, and finally they tell you vague and empty words. Now they say, ‘You’re lucky you’re getting anything.’ ”