WAM 4 - Father of the Nation for RailFans - Vikas Kumar

****NUMBERING OF FREIGHT WAGONS IN INDIAN RAILWAYS****
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For example: 61250619336
Separate all the digits of this number starting left to right and name them as C1, C2, C3, etc. till the last digit....
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6 -- C1
1 -- C2
2 -- C3
5 -- C4
0 -- C5
6 -- C6
1 -- C7
9 -- C8
3 -- C9
3 -- C10
6 -- C11
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Part I:-
6 -- C1
1 -- C2
61 -- C1 C2
It indicates the type of wagon (BCNA/BOXN/BOBYN/BOSTHMS/BTPN).
For example: '61' indicates BLCA Wagon.
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Part II:-
2 -- C3
5 -- C4
25 -- C3 C4
It indicates the owning railway of the wagon (Central Railways/Eastern Railways/Defence/Private Parties).
For example: '25' indicates a wagon owned by CONCOR.
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P.S.: For more clarity on the first four digits, kindly go through the next answer on this question.
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Part III:-
0 -- C5
6 -- C6
06 -- C5 C6
It indicates the year of manufacture of the wagon.
For example: '06' indicates a manufacturing year of 2006.
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Part IV:-
1 -- C7
9 -- C8
3 -- C9
3 -- C10
1933 -- C7 C8 C9 C10
It indicates the individual serial number of the wagon.
0001 - 0999 -- Used for departmental freight wagons
1000 - 9999 -- Used for all other freight wagons
For example:-
'1933' indicates a freight wagon used for non-departmental activities.
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Part V:-
6 -- C11
Step 1 : Starting from the left, add all the Characters in the even position. S1 = C2 + C4 + C6 + C8 + C10.
Step 2 : Multiply the sum by 3 to get 3×S1.
Step 3 : Starting from the left, add all the Characters in the odd position. S2 = C1 + C3 + C5 + C7 + C9.
Step 4 : Add the sum of step 2 to the sum of step 3 to get S4= 3×S1+S2.
Step 5 : Round this total up to the next multiple of 10.
Step 6 : The check digit is the number required to the added to round up to the next multiple of 10.
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For example:-
Let the wagon number be 61250619336.
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Step 1:-
1 -- C2
5 -- C4
6 -- C6
9 -- C8
3 -- C10
S1 = 1+5+6+9+3 = 24
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Step 2:-
3XS1 = 3X24 = 72
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Step 3:-
6 -- C1
2 -- C3
0 -- C5
1 -- C7
3 -- C9
S2 = 6+2+0+1+3 = 12
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Step 4:-
S4 = 3XS1 + S2 = 72+12 = 84
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Step 5:-
Next 10th multiple of 84 = 90
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Step 6:-
Check digit = 90-84 = 6
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Hence, the 11th digit assigned to this freight wagon is '6'.

****HOW TO KNOW THE MEANING OF FIRST FOUR DIGITS OF A NUMBER OF A FREIGHT WAGON IN INDIAN RAILWAYS****
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Part I: First two digits (C1, C2)
Number allotted to different freight wagons are as follows:-
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WAGONS (10-29)
10 -- BOXN
11 -- BOXNHA
12 -- BOXNHS
13 -- BOXNCR
14 -- BOXNLW
15 -- BOXNB
16 -- BOXNF
17 -- BOXNG
18 -- BOY
19 -- BOST
20 -- BOXNAL
21 -- BOSTHS
22 -- BOXNHL
24 -- BOXNS
COVERED WAGONS (30-39)
30 -- BCNA
31 -- BCNAHS
32 -- BCCNR
TANK WAGONS (40-54)
40 -- BTPN
41 -- BTPNHS
42 -- BTPGLN
43 -- BTALN
44 -- BTCS
45 -- BTPH
46 -- BTAP
47 -- BTFLN
FLAT WAGONS (55-69)
55 -- BRNA
56 -- BRNAHS
57 -- BFNS
58 -- BOMN
59 -- BRSTH
60 -- BFAT
61 -- BLCA
62 -- BLCB
63 -- BLLA
64 -- BLLB
65 -- BRS
66 -- BFU
67 -- BRHNEHS
68 -- BCL
69 -- BCLA
HOPPER WAGONS (70-79)
70 -- BOBYN
71 -- BOBYNHS
72 -- BOBRN
73 -- BOBRNHS
74 -- BOBRAL
75 -- BOBSN
WELL WAGONS (80-84)
80 -- BWTB
81 -- MBWT
82 -- DBKM
83 -- MBWZ
BRAKE VANS (85-89)
85 -- BZVC
86 -- BVZI
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Part II: Next two digits (C3, C4)
Number allotted to different types of owners are as follows:-
01 -- Central Railways (C.R.)
02 -- Eastern Railways (E.R.)
03 -- Northern Railways (N.R.)
04 -- North Eastern Railways (N.E.R.)
05 -- Northeast Frontier Railways (N.F.R.)
06 -- Southern Railways (S.R.)
07 -- South Eastern Railways (S.E.R.)
08 -- Western Railways (W.R.)
09 -- South Central Railways (S.C.R.)
10 -- East Central Railways (E.C.R.)
11 -- North Western Railways (N.W.R.)
12 -- East Coast Railways (E.Co.R.)
13 -- North Central Railways (N.C.R.)
14 -- South East Central Railways (S.E.C.R.)
15 -- South Western Railways (S.W.R.)
16 -- West Central Railways (W.C.R.)
24 -- Defence
25 -- C.O.N.C.O.R.
26 -- Private Parties