The Linke Hofmann Busch (LHB) coach is a passenger coach used by the Indian Railways for several of its trains. It is named after its German manufacturers, Linke-Hofmann-Busch, who are now called Alstom Transport Deutschland. The LHB coaches were first used in 2000 and are mostly produced by Rail Coach Factory in Kapurthala, India. They are designed to offer better passenger comfort and are used in premium trains like Rajdhani, Shatabdi, Duronto Express, and superfast trains.

Here are some key features of LHB coaches:

• They are made of stainless steel, making them lighter than Integral Coach Factory (ICF) coaches.
• They have an "advanced pneumatic disc brake system" that allows for efficient braking even at high speeds.
• They have modular interiors with integrated lighting, which gives an aesthetic look to the coach and ensures proper visibility at all times.
• They have a hydraulic suspension system and side suspension, which reduces jerks and makes the journey more comfortable.
• They have a center buffer coupling system that improves passenger safety in case of an accident.
• They are anti-telescopic, which means they do not flip in case of a collision.
• They have anti-climbing features, so that in case of a collision, the coaches do not climb on top of each other.

LHB coaches are relatively quieter than conventional coaches, with each coach producing a maximum noise level of 60 decibels while conventional coaches can produce 100 decibels. They are also more expensive, with each coach costing between ₹1.5 crore to ₹2.0 crore, whereas the power car which houses a generator costs about 3 crore.

In summary, LHB coaches are a type of passenger coach used by the Indian Railways that offer better passenger comfort and safety compared to conventional coaches. They have several features that make the journey more comfortable, including an advanced pneumatic disc brake system, modular interiors, and hydraulic suspension.