What makes the Vatican’s national railway unusual?

Here is the question :

WHAT MAKES THE VATICAN’S NATIONAL RAILWAY UNUSUAL?

Here is the option for the question :

• Has miniature carriages
• Has no stations
• World’s shortest national railway
• Tickets to ride it are free

The Answer:

And, the answer for the the question is :

Explanation:

[STC009768]. The Vatican’s national rail system is the world’s shortest at barely 1,000 feet. There is only one stop, and it is located in the grounds of the Vatican. The papal summer retreat is in the lakeside village of Castel Gandolfo, just outside of Rome, and visitors can catch the train there from Vatican City every Saturday.