Exhibit 21.1

American Railcar Industries, Inc. wholly owns the following companies:

Subsidiary

1. Amrail Industries, Inc., a Delaware corporation

2. ARI Component Venture, LLC, a Delaware limited liability company

3. ARI Fleet Services of Canada, Inc., a corporation registered in Ontario, Canada

4. ARI Longtrain, Inc., a Delaware corporation

5. ARI Mauritius I, a Mauritius corporation

6. Castings LLC, a Delaware limited liability company

7. Longtrain Leasing I, LLC, a Delaware limited liability company

8. Southwest Steel III, LLC, a Texas limited liability company

Castings, LLC is a joint venture partner in Ohio Castings Company, LLC, a Delaware limited liability company.

ARI Component Venture, LLC, is a joint venture partner in Axis, LLC, a Delaware limited liability company, which owns Axis Operating Company LLC, a Delaware limited liability company.

ARI Mauritius I wholly owns ARI Mauritius II, a Mauritius corporation, which is a joint venture partner in Amtek Railcar Private Limited, an Indian private limited company.