Dovetail Games (DTG), a trading name of RailSimulator.com Ltd (RSC), is a British video game developer and publisher. It was formed in 2008 by Paul Jackson (formerly VP at Electronic Arts and Director General of ELSPA, now UKIE), Tim Gatland and Charlie McMicking. It originally produced the RailWorks franchise, now called simply Train Simulator.
Source: Wikipedia, "[en.wikipedia.org/wiki/Dovetail_Games Dovetail Games]", available under the CC-BY-SA License.
Prior to 9 December 2013, Dovetail published games under their original trading name of Railsimulator.com Limited.