ok

it can lach onto a train staition it eats trains to get longer

Train eater:
fully hostile
variants:
Train eater
Train eater (small)
Hp 7300
hits:
hits with tail/butt UwU
Size little smaller than siren head (dark)
when spawnning it willl come out the ground like a train
Speed:
faster than siren head (blood)
Skills:
like behemoth he can come out of the ground and take 2000 dmg of anything
when at 2400 hp it will get stronger
can spawn train eater (small)
Train Eater (small):
same as house head minion

also the theme https://youtu.be/5aVTWB0LdDw