Is a subway bolt or a subway pipe bolt connected to a bolt? What's the difference

The subway pipe bolt is one of the subway bolts.

In fact, the so-called subway bolts are not special special bolts, but the general name of some types of bolts used in subway construction. It is characterized by high standard for steel performance grade and anticorrosion treatment.
The pipe connection bolt is a bolt connecting the subway shield component in the below figure. Long and short, straight is bent.