Main power for class-1 railroads, such as NS, UP, CSX, BNSF, etc… are anything from Dash 8 series, SD40 series units, on to the newest SD70ACe and ES44 varieties, even now the ET44 series (tier 4) units. Local and yard power can be Genset units, to rebuilt models, even things such as GP38-2, up through the GP-60 series units, along with remaining MP15 series and left-over SW series units in some areas.
Regional and shoreline operations can have just about anything you would like, from old Alco Century units, to the SD40T, to newer Genset and rebuild low-emission units, up to second hand Dash 8 series units for road power, and almost anything for yard and switcher power, from old SW series units, to new Gensets.
Industrial operations can have older SW and MP series switchers, GP-9 rebuilds, up to newer Genset’s.
As you have not mentioned scale, I will give general suggestions, in HO-scale, Atlas, Intermountain, Bowser, Athearn Genesis, and Kato are all very nice units, along with the newer Bachmann units, and Athearn RTR line for “budget friebndly” models, in N-scale Atlas, Kato are favorites, along with a few others, and in O-scale, the standard is Lionel and MTH, along with Williams (now owned by Bachmann) and Atlas-O are well liked units.
We would really need to know price range, scale, and power style (DCC, DC, DCS, Lionel Legacy, etc…) to give a specific model suggestion, along with your preference of big mainline power, railroad preference, or short line/regional diorama as far as what exact model to recommend.
And, even though you are overseas from those of us in the States, with the correct dealers, shipping is not an issue. Shipping price would be higher than we would pay for domestic shipping, but it is entirely possible to ship almost any model. Paint and chemicals is where you would find issues, as well as radio control. Most of these are USA only…