Einführung der dreistelligen Liniennummern (2.Juni 1991)
Die Verkehrssysteme von Ost und West wurden zum 2.Juni 1991 vereinigt. Erstmal wurden Regio-, S-Bahn und U-Bahn (nur Ost) Linien benannt. Die Busliniennummern wurden einem neuen Standard angepasst, die Straßenbahn blieb unberührt. Hauptsächlich wurden nur die Liniennummern angepasst, das Netz ist erst mit der Zeit zusammengewachsen.
| Linie | Entstanden aus den Linie/n | Linie | Entstanden aus den Linie/n | Linie | Entstanden aus den Linie/n |
| 100 | - | 159 | 41 (Ost) | 235 | - |
| 101 | 1 (West) | 160 | 23 (Ost) | 237 | 63 (West) |
| 104 | 4 (West) | 161 | 61 (Ost) | 240 | 30 (Ost) |
| 105 | 65 (West) | 162 | 62 (Ost) | 241 | 95 (West) |
| 106 | 16 (West) | 163 | 36 (Ost) | 245 | 90 (West) |
| 107 | 7 (Ost) | 164 | 64 (Ost) | 247 | 28 (West) |
| 108 | 8 (Ost) | 165 | 65 (Ost) | 248 | 83 (West) |
| 109 | 9 (West) | 166 | 66 (Ost) | 249 | 60 (West) |
| 110 | 10 (West) | 167 | 67 (Ost) | 250 | 33 (Ost) |
| 111 | 11 (West) | 168 | 68 (Ost) | 251 | 151 (Ost) |
| 112 | 53 (West) | 169 | 27 (Ost) | 255 | 45 (Ost) |
| 113 | 99 (West) | 170 | 68 (West) | 256 | 56 (Ost) |
| 114 | 67 (West) | 171 | 59 (West) | 257 | 9 (Ost) |
| 115 | 50 (West) | 172 | 52 (West) | 258 | 31 (Ost) |
| 116 | 6 (West) | 174 | 25 (West) | 259 | 39 (Ost) |
| 117 | 49 (West) | 175 | 82 (West) | 260 | 89 (Ost) |
| 118 | 18 (West) | 176 | 76 (West) | 263 | 38 (Ost) |
| 119 | 19 (West) | 177 | 77 (West) | 265 | 47 (Ost) |
| 120 | 12 (West) | 178 | 78 (West) | 269 | 69 (Ost) |
| 121 | 62 (West) | 179 | 79 (West) | 271 | 57 (West) |
| 122 | 22 (West) | 180 | 17 (West) | 275 | 75 (West) |
| 123 | 23 (West) | 181 | 81, 93 (West) | 283 | 32 (West) |
| 124 | 14 (West) | 182 | 2 (West) | 284 | 84 (West) |
| 125 | 15 (West) | 183 | 30 (West) | 291 | 60 (Ost) |
| 126 | 89 (West) | 184 | 96 (West) | 292 | 92 (Ost) |
| 127 | 72 (West) | 185 | 85 (West) | 294 | 53 (Ost) |
| 128 | 8 (West) | 186 | 86 (West) | 295 | 95 (Ost) |
| 129 | 29 (West) | 187 | 87 (West) | 296 | 94 (Ost) |
| 130 | 5 (West) | 188 | 88 (West) | 298 | 98 (Ost) |
| 131 | 31 (West) | 190 | 90 (Ost) | 299 | 73 (Ost) |
| 132 | 80 (West) | 191 | 91 (Ost) | 316 | 66 (West) |
| 133 | 13 (West) | 192 | 54 (Ost) | 322 | 26 (West) |
| 134 | 34 (West) | 193 | 93 (Ost) | 324 | 27 (West) |
| 135 | 35 (West) | 194 | 43 (Ost) | 327 | 71 (West) |
| 137 | 92 (West) | 195 | 75 (Ost) | 328 | 64 (West) |
| 138 | 38 (West) | 196 | 96 (Ost) | 331 | 97 (West) |
| 140 | 40 (Ost) | 198 | 44 (Ost) | 334 | 36 (West) |
| 141 | 41 (West) | 199 | 99 (Ost) | 341 | 24 (West) |
| 142 | 32 (Ost) | 204 | 74 (West) | 347 | 78E (Ost) |
| 143 | 34 (Ost) | 208 | 35 (Ost) | 350 | 52 (Ost) |
| 144 | 91 (West) | 211 | 3 (West) | 359 | 76 (Ost) |
| 145 | 54 (West) | 216 | ∆ (West) | 363 | 37 (Ost) |
| 146 | 73 (West) | 218 | ∆ (West) | 371 | 58 (West) |
| 147 | 78 (Ost) | 219 | 69 (West) | 376 | 7, 81 (West) |
| 148 | 48 (West) | 221 | 21 (West) | 383 | 33 (West) |
| 149 | 94 (West) | 222 | 20 (West) | 392 | 192 (Ost) |
| 150 | 50 (Ost) | 224 | 98 (West) | 394 | 48 (Ost) |
| 151 | 51 (Ost) | 225 | 40 (West) | 396 | 97 (Ost) |
| 154 | 77 (Ost) | 227 | 70 (West) | 459 | 39E |
| 155 | 55 (Ost) | 228 | 61 (West) | 510 | ∆ (Ost) |
| 156 | 56 (Ost) | 231 | 56 (West) | 512 | ∆ (Ost) |
| 157 | 57 (Ost) | 234 | 37 (West) | 560 | LIFT (West) |
| 158 | 42 (Ost) | ||||
| Und im Nachtverkehr: | |||||
| N1 | 111 (Ost) | N28 | 64N (West) | N60 | 114 (Ost) |
| N2 | 107 (Ost) | N29 | 29N (West) | N61 | 124 (Ost) |
| N3 | 109 (Ost) | N30 | 5N (West) | N62 | 123 (Ost) |
| N4 | 4N (West) | N33 | 13N (West) | N65 | - |
| N5 | 115 (Ost) | N34 | 34N (West) | N76 | 76N (West) |
| N6 | 61N (West) | N41 | 72N (West) | N77 | 77N (West) |
| N7 | 117 (Ost) | N42 | 104 (Ost) | N78 | 52N (West) |
| N10 | 10N (West) | N44 | 91N (West) | N82 | 2N (West) |
| N11 | 3N (West) | N45 | 54N (West) | N83 | 33N (West) |
| N15 | 1N (West) | N46 | 73N (West) | N84 | 68N (West) |
| N19 | 19N (West) | N48 | 48N (West) | N85 | 85N (West) |
| N20 | 12N (West) | N49 | 94N (West) | N86 | 86N (West) |
| N21 | 62N (West) | N51 | 101 (Ost) | N90 | 106 (Ost) |
| N22 | 20N (West) | N52 | 121 (Ost) | N91 | 102 (Ost) |
| N23 | 23N (West) | N53 | 120 (Ost) | N92 | 110 (Ost) |
| N24 | 14N (West) | N54 | 113 (Ost) | N93 | 103 (Ost) |
| N25 | 15N (West) | N55 | 108 (Ost) | N95 | 116 (Ost) |
| N26 | 83N (West) | N58 | 105 (Ost) | N98 | 112 (Ost) |
| N27 | 16N (West) | ||||