well, try these sims.
I pasted link for them before
FlightGear
FlightGear is a collaborative project that aims to create a sophisticated free software flight simulator framework. It is licensed under the GNU GPL and runs on multiple platforms and operating systems, for example Microsoft Windows (Win9x/ME/2000/XP), Linux, Mac OS X and Unix.
The simulation engine in FlightGear is called SimGear. It is used both as an end-user application and in academic and research environments, for the development and pursuit of flight simulation ideas.
http://en.wikipedia.org/wiki/FlightGear
space sim
Orbiter
Orbiter is a closed source freeware space flight simulator for the Windows operating system created by Dr Martin Schweiger, a computer scientist at University College London. The first version was released on November 27, 2000 and is an ongoing project that has been under development ever since. The latest version is release 060504 unveiled on May 4 2006.
http://en.wikipedia.org/wiki/Orbiter_(sim)
Avsim.com
Avsim.com is a popular flight simulator website. It is one of various popular places on the Internet that is dedicated to bringing files of different kinds for fans of flying simulation to download for free. The site claims to be simulation's number one website on the Internet, although that claim has also been made by other websites.
The site provides with such items as airliners, prop-liners, military aircraft, textures, airports, airport gates, flight plans and other features for people who enjoy this hobby.
http://www.avsim.com/
Train simulator
BVE (Abbreviation of Boso View Express) is a freeware train simulator written by Mr. Mackoy from Japan. It is currently available for the Windows 98, Windows Me, Windows 2000, and Windows XP operating systems. Users have also had success running BVE on software emulators such as Virtual PC, and WINE. Version 2 of BVE requires DirectX, while the latest version 4 release requires the Microsoft .NET platform be installed.
http://en.wikipedia.org/wiki/BVE
www.RailServe.com
http://www.railserve.com/Computers/
Directory of train simulator sites
Racer
www.racer.nl
The best racing out there.
Highly recommended