British Rail Class 125

British Rail Class 125
Class 125 unit leaving Broad Street in April 1969
In service	1958–1977
Manufacturer	BR Derby
Number built	20 three-car sets
Number preserved	Nil
Formation	DMBS-TS-DMS
Capacity	266 second-class, no first
Operator(s)	British Rail
Specifications
Car length	64 ft 0 in (19.51 m) over body
Width	9 ft 4 ¹⁄₂ in (2.858 m)
Height	12 ft 9 ¹⁄₂ in (3.899 m)
Maximum speed	70 mph (113 km/h)
Weight	Power cars: 39.0 long tons (39.6 t; 43.7 short tons) Trailers: 32.0 long tons (32.5 t; 35.8 short tons)
Prime mover(s)	Two 238-brake-horsepower (177 kW) Rolls-Royce C8NFLH
Power output	952 bhp (710 kW) for 3-car set
Transmission	Hydraulic, Twin-disc (Rolls-Royce) torque converter
Multiple working	Orange Star
Track gauge	4 ft 8 ¹⁄₂ in (1,435 mm)

This article is about the class of first-generation DMU. For the InterCity 125, see British Rail class 43.

The Class 125 was a design of three car Diesel Multiple Unit built for British Rail in 1958. They were high-density units, externally very similar to the Class 116. They were built specifically for the Lea Valley Line, were all withdrawn in 1977, and none survive to this day. Like many first-generation DMU classes, they never carried their 125xxx TOPS set numbers.

Numbering

Table of orders and Numbers
Lot No.	Type	Diagram	Fleet Number	TOPS Class	Seats
30462	Driving Motor Second (DMS)	596	50988–51007	125/1	91
30463	Trailer Second (TS)	597	59449–59468	185	110
30464	Driving Motor Brake Second (DMBS)	595	51154–51173	125/1	65

Liveries

They were delivered in an unlined medium shade of Brunswick green with white cab roofs and yellow speed whiskers. The whiskers were replaced during the early 1960s by split yellow warning panels, one either side of the central character train describer which remained green.

During the mid 1960s rail blue appeared, and white cab roofs were gradually dispensed with and buffer beams became black. Initially the yellow warning panels were expanded to cover the complete lower front of the driving cabs and later the whole cab fronts became yellow.

External links

History of the Class 125s

Diesel multiple units of Great Britain

First generation units:	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

First Generation Original TOPS:	140 141 142 143 144 145 147 148 149 150 160 161 162 163 164 166 167 168 169 171 172 173 175 176 177 178 179 180 182 183 185 186 188 189 190

First generation units (pre-TOPS):	British United Traction Derby Lightweight Metro-Cammell Railbus GWR railcars LMS railcars

Second generation units:	139 140 141 142 143 144 150 151 152 153 154 155 156 157 158 159 165 166 168 170 171 172 175 180 (I) 180 (II) 185 195

Diesel-electric units:	201 202 203 204 205 206 207 210 220 221 222 230 251 252 253 254 255

Diesel-electric units Original TOPS:	201 /1 /2 /3 202 /1 /2 /3 203 211 /1 /2 /3 212 221 /1 /2 /3 222 /1 /2 223 /1 /2 /3 224 225 251 261

Bi-Mode units:	800 802

Southern Region designations:	2H 3D 3H 3R 3T 4L 6B 6L 6S

Families	A-Train Civity Coradia Desiro HST Networker Pacer PPM Sprinter Turbostar Voyager

British railcars and diesel multiple units Diesel locomotives Electric locomotives Miscellaneous locomotives Diesel multiple units Electric multiple units Departmental multiple units Rolling stock of Network SouthEast

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