Coach position and numbering on Indian trains

Your coach position is where your coach sits in the train, counted from the engine. The letter tells you the class — B for AC 3-Tier, S for Sleeper, A for AC 2-Tier, H for AC First, M for AC 3-Tier Economy — and the number is which coach of that class it is. We hold rake composition from our data provider for individual trains; we do not hold live platform alignment.

Last verified 3 September 2026.

What does a coach number like B4 actually tell you?

Two things, and only two. The letter is the class of the coach. The number is which coach of that class it is, counted in the order the class appears in the rake. B4 is the fourth AC 3-Tier coach; S9 is the ninth Sleeper coach; H1 is the first AC First coach.

What it does not tell you is where the coach will physically stop. B4 is not "the fourth coach from the engine". A train can be marshalled with the pantry car and the second-class coaches in between the AC coaches, so B4 may be the eleventh vehicle in the formation or the fourth, depending on the rake. The number on your ticket is an identifier, not a distance.

There is a second number too, painted on the side of the coach, which is the coach's own number rather than anything to do with your booking. It has five or six digits: coaches built since late July 2018 carry six, the first two being the year of manufacture, and most older coaches still carry five. Corrected 4 October 2026: this page said the side number has five digits. Ignore it. The one that matches your ticket is the short code stencilled near the door and shown on the platform display.

Which letter means which class?

Coach letters as the reservation system uses them. Only the last row rests on a published rule; the rest is settled convention and is marked as such.
Code you see	Class it stands for	What it rests on
H	AC First Class (1A), or the AC First half of a composite coach	Convention
A	AC 2-Tier (2A)	Convention
B	AC 3-Tier (3A)	Convention
M	AC 3-Tier Economy (3E)	Commercial Circular 6 of 2023
S	Sleeper (SL)	Convention
C	AC Chair Car (CC)	Convention
E	Executive Chair Car (EC)	Convention; some rakes use EC or EA instead
D	Reserved second sitting (2S)	Convention
G or GS	Unreserved general second class	Convention
PC	Pantry car, with no passenger accommodation	Convention
SLR, SLRD	Seating-cum-luggage-and-brake van, D marking a Divyangjan compartment	Convention, but see below

Is there an official list of coach letters?

We could not find one, and we looked. There is no Railway Board circular, no chapter of the Commercial Manual and no Ministry page we could locate that publishes the full letter-to-class table above. We are not going to invent a citation for it. Every row marked "convention" is settled reservation-system usage that any regular traveller will recognise; it is not a rule we can point you at.

One row is different. Commercial Circular No. 6 of 2023, dated 21 March 2023, restored the separate AC 3-Tier Economy fare and instructed, word for word: "From 22.03.2023, all future bookings in AC economy coaches beyond the No Booking Date/ARP shall be done as '3F' instead of '3A'. Coach ID shall be changed to 'M instead of B'." That is the only coach letter in the table above for which we can show you a published Railway Board instruction, and it is why an AC 3-Tier Economy coach is lettered M.

What is SLRD, and why do we mention it?

Because it is the one coach code we have seen with our own eyes in our own data rather than read somewhere.

Our live data provider returns rake composition per train. On the trains a visitor had already asked about, that response listed the passenger classes with a coach count and a berth count each, and put anything that is not a booking class into a separate list. For two long-distance trains that separate list contained exactly one entry: SLRD. That is the luggage-cum-brake van with a compartment for passengers with disabilities. It is not a class you can book, which is precisely why the provider files it apart from the ones you can.

Rake composition as our data provider returned it, for the three trains our cache held on 2 September 2026. Coach and berth counts are the provider's, not ours.
Train	Class	Coaches	Berths or seats	Berths per coach
12002 Shatabdi Express	Executive Chair Car	2	112	56
12002 Shatabdi Express	AC Chair Car	14	1,092	78
12301 Rajdhani Express	AC First Class	2	48	24
12301 Rajdhani Express	AC 2 Tier	6	324	54
12301 Rajdhani Express	AC 3 Tier	11	792	72
12951 Tejas Rajdhani	AC First Class	1	24	24
12951 Tejas Rajdhani	AC 2 Tier	6	324	54
12951 Tejas Rajdhani	AC 3 Tier	11	792	72

The last column is our arithmetic on the provider's two columns, nothing more. It is worth a glance because the AC 3-Tier figure, 72 berths per coach, is the same number the Ministry of Railways used in 2021 when it compared a 3AC coach with the new economy coach. Two independent sources agreeing is not proof, but it is better than one.

What does the running order actually mean?

The running order is the sequence of vehicles from the locomotive to the tail. It is a property of the rake on the day, not of the train number, and it can be reversed end to end when a train reverses direction at an intermediate station. A coach that was tenth from the engine when you boarded can be tenth from the other end after a reversal.

This is why platform guidance exists at all. The Ministry of Railways described the equipment plainly when it introduced a new passenger information system at Anakapalle station in December 2019: the system comprises an "At a Glance Display Board" and a "Coach Guidance Display Board" which "provides the Coach Composition position of a train". The same release says the overhead coach guidance boards "are overhung on the platforms to indicate the coach position of the trains", that "coach numbers of the train from the engine, general, sleeper, AC and other coaches are displayed according to the placement of particular coaches", and that this "is displayed after announcement and before arrival of the train".

Read that last clause carefully, because it is the honest answer to "when will I know where to stand": after the announcement, and before the train arrives. Not the night before.

How do you find where your coach will stop?

In descending order of reliability:

The platform display, on the day. The coach guidance boards described above are fed from the live position of the train. This is the only source that reflects a rake that was changed this morning.
The railway's own coach position enquiry. The National Train Enquiry System publishes a "Your Train Coach Position" page. It carries its own warning, in its own words: "Data shown with (*) are dynamic in nature and may change."
The station announcement. Slower, but it is made from the same information as the boards.
Asking a member of staff on the platform. Unglamorous and frequently the fastest.

A habit worth forming on a long train: get to the platform early enough to walk. On a twenty-four coach rake the difference between the right end and the wrong end is several hundred metres, and a two-minute halt at an intermediate station does not forgive a mistake.

What can we tell you, and what can we not?

We should be exact about this, because it is the difference between a useful page and a misleading one.

What we hold. A public timetable feed, version 2026-08-30, covering 10,594 trains, 8,550 stations and 207,224 stop events — schedules, halts, distances and running days. Separately, and only for a train somebody has already looked up, rake composition from our live data provider: the classes on the train, how many coaches of each, and how many berths in each. That is where the table above came from.

What we do not hold, and will not pretend to. Live platform alignment. We do not know which platform your train will use, we do not know where on that platform your coach will halt, and we do not receive the day's actual formation. Rake composition is a description of how the train is normally made up; it is not a promise about the vehicle you will find in front of you tonight. A coach can be detached for maintenance and the whole formation renumbered without anyone telling our provider.

So: use this page to understand what B4 or M1 means and how the order works. Use the platform display, on the day, to decide where to stand. How this site works sets out our caching in more detail, and where the data comes from lists the feed and its known defects.

A few rules that survive a change of rake

The class letter is stable; the position is not. Your coach is B4 whatever happens to the order.
Chair-car trains are shorter than sleeper trains. The provider's figures above put sixteen coaches on 12002 and nineteen on 12301; on the longer train, being at the wrong end costs you more.
AC coaches are usually grouped. If you are in B4 and you can see B2, you are close.
The pantry car is a landmark. It is unmistakable from outside and it is usually near the middle of the AC block.
Check again after a reversal. If your train changes direction en route, the engine end has changed.

If you are still choosing a class rather than looking for a coach, the nine classes compared and Sleeper or 3A are the pages you want. If you have a ticket and are trying to read its status, how to read a seat availability result decodes the string.

Sources

Every factual claim above was checked against these documents on 3 September 2026, apart from the corrections made on 4 October 2026 and listed in the corrections log.

Written and reviewed by Vijesh Rathore · Page last updated 4 October 2026 · how often we re-check.

Coach position and coach numbers, explained