Bumpy Metal

[aks]

Hi,
I am making a 3d train model and want some help with textures. I am trying to get a metal look with little bumps on it, like i the photo below-

Can anyone please guide me how to produce this effect in PS, any method will be fine..like bump map or just in diffuse texture. Thank you

 

[gedstar]

Why not just search for a texture, find one that suits and free transform it for the desired effect

Here's a couple of sites
http://texturelib.com/#!/category/?path=/Textures/metal/bare
http://www.designyourway.net/drb/high-quality-metal-textures-you-would-download/