My designed image. I took around 6 hours to bring it in shape. In NX 10 I used basic extrude,revolve commands to make train tack, some kind of body of train. As per my requirement to draw the sketch i used WCS & Datum planes many times. There is shapes i used Surface Command like SWEEP , SWEPT. I had great experience while drawing and converting drawing into 3D, I used almost all commands from basic sketch to surfaces. Some kind i have hands on experience on UG NX 10 commands.