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| British Rail Class 125 | |
|---|---|
_Suburban_(later_Class_125)_E50991%2c_E59467%2c_E51157_(8204065470).jpg) Class 125 unit enteringLiverpool Street in July 1966 | |
| In service | 1959–1977 |
| Manufacturer | BR |
| Built at | Derby Works |
| Family name | First generation |
| Replaced | Steam locomotives and carriages |
| Constructed | 1958–1959 |
| Scrapped | 1971 (1), 1976–1988 |
| Number built | 20 three-car sets |
| Number scrapped | All |
| Successor | Class 312 |
| Formation | DMBS-TS-DMS |
| Fleet numbers | 50988 - 51007 (DMS) 51154 - 51173 (DMBS) 59449 - 59468 (DTS) |
| Capacity | 266 second-class, no first |
| Operators | British Railways |
| Depots |
|
| Lines served | |
| Specifications | |
| Car body construction | Steel |
| Car length | 64 ft 0 in (19.51 m) over body |
| Width | 9 ft4+1⁄2 in (2.858 m) |
| Height | 12 ft9+1⁄2 in (3.899 m) |
| Doors | Slam |
| Maximum speed | 70 mph (113 km/h) |
| Weight |
|
| 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 |
| Coupling system | Screw |
| Multiple working | Orange Star |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) |
TheBritish Rail Class 125 was a design of three cardiesel multiple unit (DMU) built byBR Derby atDerby Works in 1958. They were almost identical in appearance to theClass 116.
The Class 125 was built in 1958 at Derby Works as high capacity suburban railcars specifically for theLea Valley Lines nearStratford. They were fitted with powerfulRolls-Royce engines, allowing them to have comparable performance to contemporaryEMUs. They bore a close resemblance to the similarClass 116, which were also built at Derby. The Class 125 had a unique multiple working code (orange star), due to their unique pneumatic, rather than electric, engine control system. They also had a non-standard jumper cable arrangement and were therefore incompatible with otherBritish Rail diesel multiple unit classes. They were withdrawn in 1977 and like many other first generation DMUs, never wore their Class 125TOPS classifications.
The Class 125 operated semi-fast suburban services on the Lea valley lines until theirelectrification in 1969, after which they were replaced by EMUs. They also operated commuter services on theWest Anglia Main Line. These services were operated alongside locomotive hauled trainsets until the line was also electrified in 1969, after whichclass 302 and308 electric multiple units took over the newly electrified routes. The trains were then transferred onto theEast Coast Main Line commuter services out ofKing's Cross, where they worked for the rest of their operational lifetimes.
Two trailers (59458 + 59466) were taken into departmental (non-revenue earning) service in November 1982 and March 1984 as 975993 + 975964. They were used at theRailway Technical Centre inDerby and used as fire test vehicles. They were both withdrawn and scrapped in February 1986 and August 1988.
The Class 125s were withdrawn from ECML commuter routes in 1977, following the electrification of the ECML. They were then scrapped after a brief time in storage. No class 125 units survive to this day, as they were withdrawn before the interest in preserving multiple units began.
| Lot No. | Type | Diagram | Fleet Number | TOPS Class | Seats | Notes |
|---|---|---|---|---|---|---|
| 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 |
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 andbuffer 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.
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