| aric.net.au | Australian Railway Industry Corporation |
| aslrra.org | American Short Line and Regional Railroad Association |
| ara.net.au | Australasian Railway Association |
| intermodal.org | Iana - Intermodal Association Of North America |
| aera.co.uk | AERA - Association of European Rail Agents |
| bts.gov | Bureau of Transportation Statistics |
| cpisalumni.org | Canadian Pacific Railway Computers and Communications Alumni Association |
| chkpws.org | The China Hong Kong Permanent Way Society |
| bakfjs.org | Bulgarian Association of Consulting Companies in Railway Construction. |
| avokov.sk | AVOKOV |
| fusionproductions.com | www.fusionproductions.com/ |
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