The train is so full that a small lady would get crushed.
The train is so packed that it would be easy to crush a small girl.
電車 - train
満員 - full, packed, crammed
Full of people, so full, packed, completely full, crammed
The train is packed
The train absolutely crammed
The train is really full
The train is too full
小さいな - small ~~
小さいな体 - small body, small frame
女 - lady, woman, girl
Small woman, small girl, girl with a small frame, little lady
つぶす - crush, break. Squash
The woman will get crushed
The small girl will get squashed