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The Class 123 was a design of Diesel Multiple Unit built for British Rail in 1963. They were built by BR Swindon, and designed like all Swindon units as inter-city sets. Ten of the four-car sets were built and introduced in 1963. The units bear a visible similarity to the British Rail Class 309, however there is no 'relation' here as the two types were built by different manufacturers for different markets.

It should be noted that the Class 123's structure and internal construction have much more in common with BR coaching stock (British Rail Mark 1) than they do with other DMU classes. The carriage's underframes are longer and the end gangways are built to a different style. It is also unusual for a first-generation DMU to sport a front end gangway. None of these units survive today.

British Rail diesel multiple units
Diesel locomotives - Electric locomotives - DMU - DEMU - AC EMU - DC EMU - Departmental units
	First-generation diesel units
Classes:	100 - 101 - 102 - 103 - 104 - 105 - 106 - 107 - 108 - 109 - 110 - 111 - 112 - 113 - 114 - 115   116 - 117 - 118 - 119 - 120 - 121 - 122 - 123 - 124 - 125 - 126 - 127 - 128 - 129 - 130 - 131
Original TOPS:	140 - 141 - 142 - 143 - 144 - 145 - 147 - 148 - 149 - 150 - 160 - 161 - 162 - 163 - 164 - 166   167 - 168 - 169 - 171 - 172 - 173 - 175 - 176 - 177 - 178 - 179 - 180 - 182 - 183 - 185 - 186   188 - 189
Pre-TOPS:	British United Traction - Derby Lightweight - Metro-Cammell - Railbus GWR Railcars - LMS Railcars
	Second-generation diesel units
Classes:	140 - 141 - 142 - 143 - 144 - 150 - 151 - 153 - 154 - 155 - 156 - 157 - 158 - 159 - 165 - 166 168 - 170 - 171 - 175 - 180 - 185
	Diesel-electric units
Classes:	201 - 202 - 203 - 204 - 205 - 206 - 207 - 210 - 220 - 221 - 222 - 251 - 252 - 253 - 254 - 255
SR designation:	3D - 3H - 3R - 3T - 4L - 6B - 6L - 6S
	Departmental units
Classes:	901 - 930 - 950 - 951 - 960 - APT-E - MPV