mastodon

noun2

1. •
   Extinct elephant-like mammal of the genus †Mammut that flourished worldwide from Miocene through Pleistocene times; differs from elephants and mammoths in the form of the molar teeth.
2. •
   (figurative) Anything awkwardly large or unwieldy.

   • The battery is dying, and Natalia's iPhone charger doesn't fit my mastodon of a phone anyway. — 2017

noun1

1. •
   A nickname for both the 4-8-0 and (though erroneously) the 4-10-0 train configurations.