British Rail TOPS First Arrangement - Diesel Multiple Units

Diesel Multiple Units

The first attempt to apply TOPS to diesel multiple units saw each carriage within a unit being allocated its own unique class number. This was probably because most DMUs were not kept in permanent formations. Classes were allocated according to the following division:

100-131: Driving Motor cars 140-150: Driving Trailer cars 160-190: Trailer cars 201-203: DEMU Driving Motor cars 211-212: DEMU Driving Trailer cars 221-225: DEMU Trailer cars 251: Express DEMU Driving Motor cars 261: Express DEMU Trailer cars

However, this arrangement was later revised so that each unit adopted the class number previously given just to the main type of Driving Motor car (the exception being the DEMU units, which were completely changed). The table below cross-references the old and new TOPS classes:

First TOPS Second TOPS First TOPS Second TOPS First TOPS Second TOPS First TOPS Second TOPS
102 101 106 105 140 104 141 105
142 108 143 100 144 101 145 103
146 109 147 111 148 114 149 121
150 122 160 104 161 107 & 108 162 101
163 110 164 101 165 111 166 104
167 108 168 101 & 111 169 104 170 105
171 101 172 116 173 115 174 118
175 116 176 117 177 115 178 119
179 120 180 124 181 124 182 123
183 123 184 123 185 125 186 127
187 126 188 126 189 126 190 130
201/1 201 201/2 202 201/3 203 202/1 206
202/2 207 202/3 205 203 204 211/1 206
211/2 207 211/3 205 212 204 221/1 201
221/2 202 221/3 203 222/1 206 222/2 205
223/1 201 223/2 202 223/3 203 224 207
225 203 261 251

Read more about this topic:  British Rail TOPS First Arrangement

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