DRG renumbering plan for steam locomotives

In 1922 the Deutsche Reichsbahn began to develop a renumbering plan to standardize the numbering of steam locomotives that had been taken over from the state railways (Länderbahnen). Its basis was the corresponding DRG classification system.

The first renumbering plan in 1922 envisaged more class numbers than the later plans. The development of this scheme was discontinued because it was seen that there would be problems in practically adopting it.

The second, provisional, renumbering plan of 25 July 1923 was very like the final version of 1925 in its basic structure. It incorporated space for the new standard locomotives (Einheitslokomotiven) that were planned. The third and final renumbering plan of 1925 differed from its predecessor primarily in that all the locomotives retired up to that point – in some cases entire classes – were deleted; in addition several mistakes in the numbering were corrected.

With the exception of Bavarian classes, new locomotives built after 1923 were delivered from the outset with their new operating numbers. The actual renumbering of older engines did not begin until 1926.

Locomotives that were seen as obsolete and which would therefore soon be retired, were given serial numbers from 7001 after their class number.

Express train locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
12 7001 - 7004Prussian S 1
13 002 - 00713 001Prussian S 3Rebuild of a S 2 to a compound locomotive
13 008 - 45713 002 - 028
13 501 - 54413 501 - 504Prussian S 4
13 601 -647*, 651 - 90413 651 - 850Prussian S 5.2* Wrongly thought to be S 5.1s and so grouped into their own number range
13 1001 - 144213 1001 - 1286Prussian S 6
13 1501 - 151213 1501 - 1511Saxon VIII V1Built 1900
13 1601 - 169713 1601 - 1624Württemberg AD
13 1701 - 171413 1701 - 1714Württemberg ADh
13 1801 - 180613 1801 - 1806Oldenburg S 3
13 1851 - 186113 1851 - 1861Oldenburg S 5.2
13 7001 - 702013 7001 - 7012Saxon VIII 2
13 7101 - 712013 7101 - 7112Saxon VIII V1Built 1896/97
14 001, 00214 001, 002Prussian S 8Rebuild of S 9 into superheated steam version
14 031 - 08114 031Prussian S 9
14 101 - 11214 101 - 105Palatine P 3.I
14 121Palatine P 3.II
14 131, 132Bavarian S 2/5 (Baldwin)Vauclain compounds
14 141 - 15014 141 - 145Bavarian S 2/5
14 151 - 16114 141 - 145Palatine P 4
14 201 - 21514 201 - 215Saxon X V
14 301 - 31814 301 - 317Saxon X H1
14 401 - 403, 451 - 454Baden II d
15 00115 001Bavarian S 2/6
16 001 - 00316 001 - 003Oldenburg S 10
17 001 - 12717 001 - 135Prussian S 10
17 201 - 29217 201 - 296Prussian S 10.2
17 301 - 32617 301 - 322Bavarian C V
17 401 - 42017 401 - 420Bavarian S 3/5N
17 501 - 52417 501 - 524Bavarian S 3/5H
17 601 - 60617 601 - 606Saxon XII H
17 701 - 734, 751 - 75517 701 - 734, 751 - 755Saxon XII HV
17 801 - 80417 801 - 804Saxon XII H1
17 1001 - 120817 1001 - 1209Prussian S 10.11911 and 1914 versions
18 001 - 01018 001 - 010Saxon XVIII H
18 101 - 13718 101 - 137Württemberg C
18 201…25818 201…256Baden IV fNot all numbers were utilised
18 301 - 303, 311 - 319, 321 - 32818 301 - 303, 311 - 319, 321 - 328Baden IV h
18 401 - 447, 451 - 463, 471 - 48018 401 - 434, 441 - 458, 461 - 508Bavarian S 3/6, Palatine S 3/618 509 - 548 were follow-on orders by the DRG
19 001 - 02319 001 - 023Saxon XX HV

Passenger train locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
33 7001 - 7007Oldenburg P 3.2
34 7001 - 7012Prussian P 3.1
34 7101 - 7134Prussian P 3.2
34 7201 - 7204Mecklenburg P 2
34 7301 - 7318, 7354 - 7366, 7370 - 737734 7301 - 7308, 7351 - 7364Mecklenburg P 3.1
34 7351 - 7353Mecklenburg P 3.2Ex Prussian P 3.2, transferred in 1920 to Mecklenburg
34 7401, 7402Palatine P 1.I
34 7411 - 7415Palatine P 1.III
34 7421 - 7440Bavarian B IX
34 7451Palatine P 1.II
34 7461, 7462Bavarian B VI
34 7501 - 7513Bavarian B X
34 7601 - 7604, 7611 - 763334 7611Saxon III
34 7701 - 788234 7701, 7702, 7721 - 7807Saxon IIIb
34 7901 - 791834 7901, 7902Saxon IIIb V
34 8001 - 8003Saxon VI
34 8011 - 802334 8011Saxon VIb V
34 8101 - 812334 8101, 8102Württemberg A
34 8131 - 8134Württemberg Ab
34 8201 - 823134 8201 - 8209Württemberg Ac
35 7001 - 7020Palatine P 2.I
36 001 - 00236 001Prussian P 4.2Rebuild of P 4.1, Erfurt version, to compound working
36 003 - 54036 002 - 438Standard version
36 601 - 626, 651 - 66236 601 - 620, 651 - 662Mecklenburg P 4.2
36 701 - 73136 701 - 708Bavarian B XI ZwTwo-cylinder locomotive
36 751 - 85036 751 - 826Bavarian B XI VbCompound locomotive
36 861Bavarian P 2/4Not included in the second renumbering plan
36 901 - 919, 921 - 101836 901 - 919, 921 - 948, 951 - 1014Saxon VIII V2
36 1101-1106Baden II cBuilt 1900
36 1201 - 121936 1201 - 1219Oldenburg P 4.1
36 1251 - 125836 1251 - 1258Oldenburg P 4.2
36 7001, 7002Prussian P 4.1Erfurt version
36 7003 - 716836 7001 - 7009Standard version (so-called Hannover version)
36 7201, 7202Mecklenburg P 4.1Ex Prussian P 4.1, transferred in 1920 to Mecklenburg
36 7301 - 7303, 7311 - 7314, 7321 - 7323Baden II a
36 7331 - 7335Baden II b
36 7351, 7361 - 7371, 7381, 7382Baden II cBuilt 1892 - 1897
37 001 - 15137 001 - 163Prussian P 6
38 001 - 01338 001 - 013Bavarian P 3/5 N
38 101 - 108Württemberg D
38 201 - 32438 201 - 324Saxon XII H238 325 - 334 were follow-on orders by the DRG
38 401 - 48038 401 - 480Bavarian P 3/5 H
38 1001 - 3825, 3951 - 405138 1001 - 3832, 3951 - 4051Prussian P 8, Mecklenburg P 8, Oldenburg P 8, Baden P 8
38 7001…708038 7001…7073Baden IV eNot all numbers were utilised
39 001 - 20939 001 - 230Prussian P 1039 231 - 260 were follow-on orders by the DRG

Goods train locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
51 7001 - 7019Oldenburg G 1
52 7001 - 700652 7001Saxon IIIb
52 7101Württemberg B 3
53 001 - 29753 001 - 025Prussian G 4.2
53 301 - 33753 301 - 327Prussian G 4.3
53 401 - 405, 451Mecklenburg G 4.2
53 501 - 504Palatine G 3/3
53 601 - 740, 75153 601 - 729, 751Saxon V V53 751 was a follow-on order with a different boiler
53 801-89853 801 - 865Württemberg Fc
53 901-926Baden VII dBuilt 1901/02
53 1001 - 1011, 1051–105853 1001 - 1011, 1051–1058Oldenburg G 4.2
53 7001 - 752253 7001 - 7157Prussian G 3
53 7601 - 769253 7601 - 7617Prussian G 4.1
53 7701 - 7705Mecklenburg G 3
53 7801 - 7821Palatine G 2.I
53 7831 - 7833Bavarian C IIISigl version
53 7834 - 7868Ex Bavarian Ostbahn
53 7871 - 7990
53 7991 - 8009Palatine G 2.II
53 8011 - 808053 8011 - 8076Bavarian C IV ZwTwo-cylinder locomotive
53 8081 - 817053 8081 - 8168Bavarian C IV VbCompound locomotive
53 8201 - 829453 8201 - 8211Saxon V
53 8301 - 838753 8301Württemberg F 2
53 8401-8411Württemberg F 1
53 8451, 8452Württemberg F 1c
53 8501 - 859653 8501…8586Baden VII aLast number range was not fully utilised
53 8597 - 859953 8587, 8597, 8598Baden VII c
53 8601 - 8665Baden VII dBuilt 1893 - 1899
54 001 - 19354 001 - 071Prussian G 5.1
54 201 - 51754 201 - 386Prussian G 5.253 368 - 386 and other
ex-Alsace-Lorraine G 5.2
54 601 - 70854 601 - 671Prussian G 5.3
54 801 - 115654 801 - 1092Prussian G 5.4
54 1201 - 120454 1201 - 1203Mecklenburg G 5.4
54 1301 - 135954 1301 - 1364Bavarian C VI
54 1401 - 142754 1401 - 1432Bavarian G 3/4 N
54 1501 - 172554 1501 - 1725Bavarian G 3/4 H
55 001 - 68055 001 - 660Prussian G 7.1
55 701 - 153355 701 - 1392Prussian G 7.2
55 1601 - 226655 1601 - 2256Prussian G 8
55 2301 - 243255 2301 - 2433Prussian G 9
55 2501 - 566755 2501 - 3366, 3367 - 5622Prussian G 8.1
55 5701 - 570555 5701 - 5705Mecklenburg G 7.2
55 5801 - 5810, 5851 - 585255 5801 - 5810, 5851 - 5852Mecklenburg G 8.1
55 5901 - 592255 5901 - 5922Palatine G 5
55 6001 - 602355 6001 - 6013Saxon I V
55 6101 - 6119Baden VIII c
55 6201 - 621355 6201 - 6213Oldenburg G 7
55 7001-7006Palatine G 3
55 7101, 7102Bavarian BB I Palatine G 4.II
55 7201 - 721555 7201 - 7215Palatine G 4.I
56 001 - 00556 001 - 005Prussian G 7.3
56 101 - 18556 101 - 185Prussian G 8.3
56 201 - 20556 201 - 205Mecklenburg G 7.3
56 301 - 353Bavarian E I
56 401 - 40456 401 - 404Bavarian G 4/5 N
56 501 - 51656 501 - 516Saxon IX V
56 601 - 62556 601 - 625Saxon IX HV
56 701…78556 701…785Baden VIII eNot all numbers were utilised
56 801 - 809, 901 - 1034, 1101–112556 801 - 809, 901 - 1035, 1101–1125Bavarian G 4/5 H
56 2001 - 248556 2001 - 2485, 2551 - 2905Prussian G 8.2, Oldenburg G 8.256 2906 - 2916 were follow-on orders by the DRG
57 001 - 014, 021 - 08357 001 - 014, 021 - 083Saxon XI V
57 101 - 10557 101 - 105Saxon XI H
57 201 - 21857 201 - 218Saxon XI HV
57 301 - 30457 301 - 304Württemberg H
57 401 - 41757 401 - 417Württemberg Hh
57 501 - 508, 511 - 59057 501 - 507, 511 - 590Bavarian G 5/5
57 1001 - 1394, 1396 - 2740, 2892 - 310057 1001 - 2726, 2892 - 3524Prussian G 10
58 001 - 01558 001 - 015Prussian G 12.1
58 101 - 11458 101 - 114Saxon XIII HBuilt 1917, like the Prussian G 12.1
58 201…31858 201…318Baden G 12Not all numbers were utilised
58 401 - 46258 401 - 462Saxon XIII HBuilt 1919 - 1924, wie Prussian G 12
58 501 - 54358 501 - 543Württemberg G 12
58 100158 1001Prussian G 12Built for the CFOA (Turkey), taken over by Prussia
58 1002 - 214358 1002 - 2143
59 001 - 03459 001 - 044Württemberg K

Passenger train tank locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
69 7001 - 7003*Prussian T 4.2* 69 7001, 7002 wrongly classed as T 4 of the 2nd Berlin variant
70 001 - 09770 001 - 097Bavarian Pt 2/3
70 101 - 105, 111 - 12570 101 - 105, 111 - 125Baden I g70 126 - 133 were follow-on orders by the DRG
70 7001Prussian T 41. Magdeburg variant
70 7002 - 7004, 7015 - 70162nd Berlin variant
70 7005 - 7014, 7017 - 7033, 7036 - 7038Prussian T 4.1
70 7034, 7035Prussian T 4.3
70 7101 - 715570 7101 - 7154Bavarian D IX
71 001 - 116*71 001 - 026Prussian T 5.1* 71 019, 020, 029 - 031 wrongly classed T 5.2
71 201 - 21271 201 - 212Bavarian Pt 2/4 H
71 301 - 39171 301 - 385Saxon IV T
71 401 - 42071 401 - 420Oldenburg T 5.1
71 7001 - 7005Baden IV d
72 001 - 016*72 001, 002Prussian T 5.2* 72 016 wrongly classed T 5.1
72 101, 10272 101, 102Bavarian Pt 2/4 N
73 001 - 02873 001 - 028Palatine P 2.II
73 031 - 12473 031 - 125Bavarian D XII73 125 ex Alsace-Lorraine T 5
73 131 - 13973 131 - 139Bavarian Pt 2/5 N
73 20173 201Bavarian Pt 2/5 H
74 001 - 36874 001 - 358Prussian T 11
74 401 - 139674 401 - 543, 545 - 1300Prussian T 12
75 001 - 09375 001 - 093Württemberg T 5
75 101…30275 101…302Baden VI bNot all numbers were utilised
75 401…49475 401…494Baden VI cBuilt 1914 - 1918, Not all numbers were utilised
75 501 - 505, 511 - 58875 501 - 505, 511 - 588Saxon XIV HT
75 1001 - 1023, 1101–112075 1001 - 1023, 1101–1120Baden VI cBuilt 1920/21
76 001 - 01176 001 - 011Prussian T 10
77 001 - 01277 001 - 012Palatine P 5
77 101 - 12977 101 - 129Palatine Pt 3/6, Bavarian Pt 3/6
78 001 - 281, 321 - 37178 001 - 282, 351 - 523Prussian T 18, Württemberg T 1878 524 - 528 were follow-on orders by the DRG
79 001, 00279 001, 002Saxon XV HTV

Goods train tank locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
88 7001 - 7003Palatine T 2.I
88 7011 - 7017Bavarian D I
88 7021 - 7026Bavarian D IVex-Bavarian Ostbahn
88 7101 - 723288 7101 - 7201Bavarian D IV
88 7301 - 733188 7301 - 7321Palatine T 1
88 740188 7401Württemberg T
88 7501 - 750388 7501 - 7503Baden I b
88 7511…756388 7511…7563Baden I eNot all numbers were utilised
89 001 - 08089 001 - 078Prussian T 8
89 101 - 12189 101 - 121Palatine T 3
89 201 - 27489 201 - 269Saxon V TBuilt 1896 - 1901
89 281 - 29589 281 - 295Built 1914 - 1919
89 301 - 40389 301 - 410Württemberg T 3
89 411 - 41489 411Württemberg T 3L
89 501 - 506Baden X a
89 601 - 67089 601 - 670Bavarian D II
89 701 - 71789 701 - 717Bavarian R 3/3Built 1906 - 1913, same as the D II
89 801 - 89089 801 - 890Built 1921 - 1922
89 7001 - 774589 7001 - 7511Prussian T 3
89 7801 - 793789 7801 - 7868Prussian T 7
89 8001 - 8045, 8050 - 805189 8001 - 8022, 8050 - 8051Mecklenburg T 3a
89 8053 - 806989 8053 - 8068Mecklenburg T 3b
89 8101 - 811089 8101 - 8110Bavarian D V
89 8201 - 8233, 8251 - 827289 8201 - 8221, 8251 - 8267Saxon V TBuilt 1872 - 1895
89 8301 - 830789 8301, 8302Baden IX aFormer cog locomotives
90 001 - 328 (including T 9 and wrongly classed T 9.2)90 001 - 115, 117 - 231*Prussian T 9.1* 90 022, 023, 123, 124 wrongly classed T 9.2
90 002, 003, 066, 067Prussian T 9Langenschwalbach version
90 154, 155, 167, 180 - 183, 351 - 36390 116Prussian T 9Elberfeld version
91 001 - 162 (including the wrongly classed T 9.1)91 001 - 115*Prussian T 9.2* 91 088, 089, 109 - 114 wrongly classed as T 9.1
91 301 - 1771 (including the wrongly classed T 9.1)91 301 - 1805*Prussian T 9.3* 91 301, 302 wrongly classed T 9.1
91 1901 - 195091 1901 - 1950Mecklenburg T 4
91 2001 - 201091 2001 - 2010Württemberg T 9
92 001 - 01192 001 - 011Württemberg T 6
92 101 - 10892 101 - 108Württemberg T 4
92 201…32092 201…320Baden X bNot all numbers were utilised
92 401 - 41392 401 - 413Oldenburg T 13.1, Prussian T 13.1
92 501 - 505Prussian T 13Hagans type
92 506 - 98692 501 - 913, 1001–1072Prussian T 13, Oldenburg T 13
92 2001 - 204092 2001 - 2049Palatine R 4/4, Bavarian R 4/4
93 001 - 40593 001 - 406Prussian T 14
93 406 - 73993 501 - 1261Prussian T 14.1, Württemberg T 14
94 001 - 00494 001 - 004Palatine T 5
94 101 - 13094 101 - 130Württemberg Tn
94 201 - 46294 201 - 467*Prussian T 16* 94 465 - 467 wrongly classed T 16.1, reclassified in 1934 to 94 1378 - 1380
94 501 - 139094 501 - 1377*, 1501–1740Prussian T 16.1* 94 501 wrongly classed T 16
94 1901 - 190894 1901 - 1908Saxon XI HTAxle load 15 t
94 2001 - 208794 2001 - 2139Axle load 16 t
94 7001 - 7022Prussian T 15Hagans version
95 001 - 045Prussian T 20
96 001 - 02596 001 - 025Bavarian Gt 2x4/4

Cog locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
97 001 - 03497 001 - 030Prussian T 26
97 101 - 10497 101 - 104Bavarian PtzL 3/4
97 201 - 204, 251 - 25397 201 - 204, 251 - 253Baden IX b
97 301 - 30997 301 - 307Württemberg Fz
97 40197 401Prussian T 28
97 501 - 504Württemberg Hz

Branch line locomotives

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
98 001 - 01598 001 - 015Saxon I TV
98 101 - 13898 101 - 137Oldenburg T 2
98 201 - 21598 201 - 215Oldenburg T 3
98 301 - 306Bavarian PtL 2/2 (Krauss)Krauss type, inside drive
98 311 - 33998 301 - 309Krauss type, jackshaft
98 340 - 35298 310 - 322Krauss type, standard drive
98 361 - 383Bavarian PtL 2/2 (Maffei)Maffei version
98 401 - 40398 401 - 403Palatine T 4.II
98 411 - 423, 431 - 55698 411 - 423, 431 - 556Bavarian D XI
98 561 - 56898 561 - 568Bavarian PtL 3/4
98 571 - 57798 651 - 657Palatine T 4.I
98 581 - 58898 681 - 688Palatine D VIII
98 591 - 60098 661 - 669Bavarian D VIIIBuilt 1888-1893
98 601 - 60998 671 - 679Built 1898-1903
98 701 - 73198 701 - 731Bavarian BB II
98 801 - 85398 801 - 900Bavarian GtL 4/498 901-917 were follow-on orders by the DRG
98 7001Saxon VII TSV
98 7011 - 701698 7011Saxon VII TS
98 7021Saxon VII Tex Berlin-Dresden line, Hanomag version, built 1884
98 703198 7031Hartmann version, built 1885
98 704198 7041Karlsruhe version, built 1873
98 7051 - 708898 7051 - 7079Hartmann version, built 1882 - 1894
98 7091 - 709398 7091Schichau version, Years of manufacture 1873/74
98 7101, 7111 - 712098 7111 - 7113Saxon VII
98 7201 - 7204, 7211 - 723998 7211, 7212, 7221 - 7227Saxon IIIb T
98 7301, 7302, 7311-731698 7311, 7312Saxon II
98 7401 - 740698 7401 - 7405Oldenburg T 1.2
98 7501 - 754598 7501 - 7526Bavarian D VI
98 7601 - 7614, 7621 - 768198 7601 - 7614, 7621 - 7681Bavarian D VII
98 7691, 769298 7691, 7692Bavarian PtL 3/3
98 7701 - 770998 7701 - 7709Bavarian D X

Narrow gauge locomotives

1000 mm Gauge

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
99 001 - 00599 001 - 005Palatine L 2
99 01199 011Palatine Pts 2/2
99 021 - 02399 021 - 023Oldenburg B
99 031, 032, 041 - 045, 051, 052, 061 - 06399 031, 032, 041 - 045, 051, 052, 061 - 063Prussian T 33
99 071 - 07599 071 - 075Bavarian LE
99 081 - 09299 081 - 092Palatine L 1
99 09399 093Palatine Pts 3/3 N
99 101 - 10399 101 - 103Palatine Pts 3/3 H
99 12199 121Württemberg Ts 3
99 131 - 13399 131 - 133Bavarian Pts 3/4
99 141Prussian T 35
99 15199 151Bavarian Gts 4/4
99 161 - 16399 161 - 163Saxon I M
99 171 - 17399 171 - 173Württemberg Ts 4
99 181 - 183Prussian T 40
(Württemberg Ts 5)99 191 - 194 were follow-on orders by the DRG
99 20199 201Bavarian Gts 2x3/3
99 7101, 710299 7102Prussian T 31

900 mm Gauge

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
99 301, 302Mecklenburg T 7Built 1891 - 1898
99 303 - 30599 301 - 303Built 1910 - 1914
99 311 - 31399 311 - 313(Mecklenburg T 42)

785 mm Gauge

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
99 401 - 40899 401 - 408Prussian T 37
99 411 - 42199 411 - 421Prussian T 38
99 431 - 43599 431 - 435Prussian T 3999 441 - 446 were follow-on orders by the DRG
99 7401 - 7404Prussian T 31
99 7411 - 7413Prussian T 31

750 mm Gauge

Original operating numbers
1923 - 2nd renumbering plan
Final operating numbers
1925 renumbering plan
State railway classRemarks
99 501 - 50499 501 - 504Württemberg Tss 3
99 511 - 546, 551 - 558, 561 - 579, 581 - 60899 511 - 546, 551 - 558, 561 - 579, 581 - 608Saxon IV K
99 611 - 61999 611 - 619Saxon V K
99 631 - 62399 621, 622Württemberg Tss 4
99 631 - 63999 631 - 639Württemberg Tssd
99 641 - 655, 99 671 - 71799 641 - 655, 99 671 - 717Saxon VI K
99 7501 - 753799 7501 - 7527Saxon I K
99 7541 - 754699 7541 - 7546Saxon III K
99 7551Saxon II KDouble locomotive, comprising two I Ks

Literature

  • Helmut Griebl, Fr. Schadow: Verzeichnis der deutschen Lokomotiven 1923 - 1965; Transpress VEB Verlag für Verkehrswesen Berlin, Verlag Josef Otto Slezak Wien 1967
  • Valtin, Wolfgang: Verzeichnis aller Lokomotiven und Triebwagen - Band 2; Transpress Verlagsgesellschaft mbH Berlin 1992; ISBN 3-344-70740-X
  • Herbert Rauter, Dr. Günter Scheingraber, Manfred Weisbrod: Preußen-Report, Bände 3 - 8; Herrmann Merker Verlag Fürstenfeldbruck 1991 - 1994
gollark: No actual drawing of graphs occurs, but it's effectively that.
gollark: ↑ blatantly stolen from the internet
gollark: https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.ErSQsJ4GpOj4abc9DfPkagAAAA%26pid%3DApi&f=1
gollark: It basically just uses the derivative to draw a tangent line from your current best guess of the root/zero of a function out until it hits the X axis, repeatedly.
gollark: Works for me.

See also

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