RR track is tough material, even with penetration of work hardened layers. In this size & proportion, I'd think judicious use of hammer 28-32 ounce max wouldn't tax the shaping or polish.
I have one piece sized much the same, in original contour. Often tempted to make it more anvil-like, commencing by milling new profile. Hesitant what results under a high-speed endmill would attain.
Tuomas, the profile you have created By HAND is really perfection of a full size example. 1000% beyond an import too; mere cast-iron clump, no resonance, or attention paid to a proper horn.
No need to name it. Already known as Pennsylvania Short Line, in honor of Monopoly game; property and token.