Which train, earlier known as Train 18, was officially named the Vande Bharat Express by the Ministry of Railways?

Introduction / Context:
Indian Railways has been modernising its fleet by introducing new semi high speed and high comfort trains. One of the most important additions was an indigenously built train set originally called Train 18. Later, this train received an official service name that reflected national pride and modernisation. This question checks knowledge of that renaming.

Given Data / Assumptions:
- The Ministry of Railways decided to name a train Vande Bharat Express.
- The train was earlier referred to by a project style name Train 18.
- Options list several other named services like Uday Express, Antyodaya and Humsafar in addition to Train 18.
- The task is to match the earlier designation with the official service name.

Concept / Approach:
The concept here is straightforward factual recall from current affairs about Indian Railways. Train 18 was developed by the Integral Coach Factory as a chair car train set with modern amenities. When the government launched it in regular service, it was given the name Vande Bharat Express to emphasise the Make in India initiative and India focused branding. Therefore, the correct option is the one that identifies Train 18 as the train that became Vande Bharat Express.

Step-by-Step Solution:
Step 1: Recall that Train 18 was promoted as India's first semi high speed engineless train set. Step 2: Remember that after successful trials, the government decided to operate it on the New Delhi to Varanasi route under a formal service name. Step 3: That service name was announced as Vande Bharat Express to symbolise national development and self reliance. Step 4: Compare this recollection with the options and identify Train 18 as the correct earlier label.

Verification / Alternative check:
Media coverage around the launch highlighted that Train 18 was renamed Vande Bharat Express just before it entered commercial service. Articles often used phrases like Train 18, now called Vande Bharat Express. In contrast, Uday Express, Antyodaya Express and Humsafar Express are different train categories introduced earlier to serve other passenger segments and were never known as Train 18.

Why Other Options Are Wrong:
- Uday Express 1: Uday Express refers to Utkrisht Double Decker Air Conditioned Yatri trains and is unrelated to Train 18.
- Antyodaya 10: Antyodaya Express is a different category aimed at unreserved passengers and was not the prototype semi high speed train.
- 23 Humsafar Express: Humsafar trains are fully air conditioned three tier services, different from the advanced train set technology of Train 18.

Common Pitfalls:
A common mistake is to mix up the names of various special trains introduced in recent years. Students might recall that many new categories were launched and may confuse them if they do not link the unique feature of an engineless semi high speed train set specifically with Train 18 and Vande Bharat Express. Always associate Train 18 with Vande Bharat Express to avoid this confusion.

Final Answer:
The train that was originally known as Train 18 and later named Vande Bharat Express is Train 18.