3 buttons for ID

[Sonofacqms]

Any help with these would be appreciated, it has been suggested that they are Railway buttons, but the crown has made me wonder if they could be something else.

Thanks for looking

Rob

[Milmed]

Two SAR buttons are for South African Railways c.1910 - 1916
The white metal one is for uniformed staff and brass for senior uniformed officials

[btns]

The third button has been sold on e-bay as Trinidad Volunteer Guard

[Sonofacqms]

Thanks chaps, the railway buttons are of no real interest to me, so I will move them on.
Regards Rob