此处的NYC地铁数据不正确

import requests

def fetch_subway_data(api_url):
    try:
        response = requests.get(api_url)
        response.raise_for_status()  # 检查HTTP请求是否成功
        data = response.json()
        return data
    except requests.exceptions.RequestException as e:
        print(f"Error fetching data: {e}")
        return None

def validate_data(data):
    if not data:
        print("No data received.")
        return False
    
    # 假设我们期望每条记录都有一个有效的‘train_id’字段
    for record in data:
        if 'train_id' not in record or not record['train_id']:
            print(f"Invalid record found: {record}")
            return False
    return True

# 示例API URL
api_url = "https://example.com/api/subway_data"
data = fetch_subway_data(api_url)
if validate_data(data):
    print("Data is valid.")
else:
    print("Data validation failed.")