This Train SVG icons is a nice design for client needs. And among other things, this flat design is pretty important for your work.
You have the download buttons bellow and can choose between two popular extensions, SVG or PNG formats. Also, before downloading the Train SVG icon, you can try the colors from the top of the icon, and test it, if the color fit with your ideas. If not, just refresh the page and you'll have new posibillities