I could be wrong but a lot of businesses in this industry are small companies that are closley held---not traded on the stock exchange. Amsted may be one. I know several engineers in the rail business and they seem to ping-pong across different companies in the rail services industry---many of which are not publically traded companies.
You may want to check GOOGLE to see if Amsted is a subsidiary of a large company.
On another note, I don't own RAIL but follow it. My first reaction to a bad quarter (for RAIL) was that ARII, GBX or TRN may have taken business from RAIL.
Yahoo financials indicate that RAIL has over $9 per share in cash. I wonder if they have any other assets that would make them a potential take-over candidate or venture capital buyout. By other assets I mean intellectual properties or a unique set of skill-sets or strategically located plant.