Seat & coach info

How a coach is laid out

A reserved sleeper coach is divided into repeating sections. Each main bay sits between two partitions and holds a cluster of berths facing each other; running alongside the corridor is a narrower "side" pair. Put together, a bay plus its side berths is the unit that repeats down the length of the coach.

The two things that change between coach types are how many berths are stacked in the main bay — two high or three high — and whether the coach is air-conditioned. Everything else, from the corridor to the side berths, follows the same idea.

How berths are numbered

Berth numbers run in order along the coach, and within each section they tend to follow a repeating pattern. These are the common patterns — exact numbering can vary by coach make, so treat them as the usual case rather than a rule:

• Sleeper & AC 3-Tier. In a group of eight, the berths typically run lower, middle, upper on one side and lower, middle, upper on the other, then a side lower and side upper — for example 1 lower, 2 middle, 3 upper, 4 lower, 5 middle, 6 upper, 7 side-lower, 8 side-upper. The next section continues 9–16, and so on.
• AC 2-Tier. With no middle berth, a group of six usually runs lower, upper, lower, upper, then side-lower and side-upper — for example 1 lower, 2 upper, 3 lower, 4 upper, 5 side-lower, 6 side-upper.

Knowing the pattern lets you read a berth number before charting: once you know your number, you can usually tell whether it will be a lower, middle, upper or side berth.

Coach types at a glance

• SL — Sleeper. Non-AC, three berths high in the main bay. The most spacious-per-rupee option for overnight travel.
• 3A — AC 3-Tier. The same three-high arrangement, air-conditioned, with bedding.
• 2A — AC 2-Tier. Two berths high, more headroom and privacy curtains, no middle berth.
• 1A — AC First Class. Enclosed cabins (four berths) and coupés (two berths) rather than open bays; lower and upper berths only.

For what these classes cost and feel like in practice, and which to pick, see the seat guide; for the quota and status codes that appear alongside them, see the railway guide.

Your coach on the train

Your coach's position in the rake — which end of the platform it will stop at — is generally settled when the chart is prepared, since coach composition can change up to that point. Rather than guess a position in advance, it's worth confirming once the chart is out. You can read a live ticket status, including coach and berth once assigned, by checking your PNR.

About live seat maps

A live seat map — showing exactly which berths are free on a specific train and date — depends on real-time availability and coach-layout data. Until that source is connected, this page stays a general reference rather than a live map, because a plausible-looking but invented layout would be worse than none. If you're waitlisted and want a sense of your chances now, the waitlist calculator works from your current position.