We do not have a download file for the latest version (1.5.1), but you can try downloading it from the developer's site
Download version 1.2.3766 from Software Informer
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The file is clean, see the report.
Version: 1.2.3766 (x86)
Date update: Feb 21, 2017
File name: openrails-1.2-setup.exe
Size: 40.5 MB