yep very important to look at what lenses are available and more importantly the price of them
For general railway photography you'll need a good general lens something like a 17-70mm 2.8 sigma or the 17-85mm canon both offer good coverage for lineside or station wk.
A wide angle lens is good too as you can get close to your subject ie gala days when lots of bods around! something like a 10-20mm
A long telephoto can be usefull too, something like a 70-200/300 would do but you'd prob find yourself not using it much.
i'd avoid super telephoto lens like the 18-200 or 18-250 type lens as they're not really good at either end of the spectrum.

For general railway photography you'll need a good general lens something like a 17-70mm 2.8 sigma or the 17-85mm canon both offer good coverage for lineside or station wk.
A wide angle lens is good too as you can get close to your subject ie gala days when lots of bods around! something like a 10-20mm
A long telephoto can be usefull too, something like a 70-200/300 would do but you'd prob find yourself not using it much.
i'd avoid super telephoto lens like the 18-200 or 18-250 type lens as they're not really good at either end of the spectrum.