Gotta admit, your screen name threw me off a few time at first... "What does this guy do, building ships, and calls himself "Tanker?" Didn't cross my mind that you meant:
See, being an Army guy, "Tankers", to me, are automatically these dirty, noisy, unshaven, and sometimes undisciplined clowns that run around, over and (usually) THROUGH the countryside breaking stuff and blowing up what they can't break while running over "Crunchies"... AKA "Clankers" (cuz of the tracks) and DATs (DumbAzz Tankers), cuz they got little guns on top of and inside turrets that go "DAT-DAT-DAT" too...
Even though I used to be quite the model railroader, I never even THOUGHT about tank-cars, either...
But I got ya figured out eventually, TB...