MR electric units

MR electric units
In service	until 1953

The Midland Railway experimented with electrification on its Heysham–Morecambe–Lancaster line in Lancashire, England. Electric trains started to run over this route in 1908, using the overhead 6.6 kV, 25 Hz AC electric supply installed and generated at the MR's own power station in Heysham.

The electric multiple units consisted of three driving motor coaches and six driving trailer coaches. Since the DM cars had a cab at each end, this allowed trains of one, two, or three cars to be formed.

Driving motors

The three DM cars were built by the MR at their Derby Works and were 60 feet (18.29 m) in length. Two had Siemens electrical equipment fitted, while the third had Westinghouse equipment.

LMS numbers for the motor coaches 28610-28612

Driving trailers

Of the six DT cars, four were built new by the MR at their Derby works, while the other two were converted from existing hauled stock compartment coaches.

Withdrawal

In February 1951, these venerable units were finally withdrawn from service. Steam locomotive-hauled trains operated passenger services over the Lancaster–Heysham Line from then until August 1953, when electric trains took over again, this time the prototype Class AM1 units following the installation of the appropriate new equipment.

The line voltage remained at 6,600 but the frequency was altered to 50 Hz and this was transformed and rectified on the trains to supply DC traction motors. This experiment led to the introduction of the 25 kV, 50 Hz system as standard for new electrification on British Railways.

Sources

Marsden, Colin J. (1985) 100 Years of Electric Traction, Oxford Publishing Company, ISBN 0-86093-325-3
Ian Allan Ltd (1948) ABC Of British Electric Trains

Electric multiple units of Great Britain

AC units (300–399):	300 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 (I) 316 (II) 316 (III) 317 318 319 320 321 322 323 325 331 (I) 331 (II) 332 333 334 341 342 345 350 (I) 350 (II) 357 360 365 370 371 373 374 375 376 377 378 379 380 381 385 387 390 395 397

AC units (700–899):	700 707 710 717 800 801 802

AC units (pre-TOPS):	AM1 AM2 AM3 AM4 AM5 AM6 AM7 AM8 AM9 AM10 AM11 LB&SCR CP LB&SCR CW LB&SCR SL MR Lancaster units

DC units (400–599):	401 402 403 404 405 410 411 412 413 414 415 416 418 419 420 421 422 423 424 427 430 431 432 438 442 444 445 446 447 450 455 456 457 458 460 465 466 471 480 482 (I) 482 (II) 483 485 486 487 488 489 499 (I) 501 502 503 504 505 506 507 508 510

DC units (Original TOPS):	411 412 413 414 421 422 423 424 431 432 441 442 451 452 453 461 462 491 492

DC units (pre-TOPS):	BEMU LMS electric units LNER Tyneside units LNWR electric units LOR electric units LYR electric units Mersey Railway electric units NER electric units W&CR electric units

Southern Railway designations:	2-BIL 2-EPB 2-HAL 2-HAP 2-NOL 2-PAN 2-PEP 2-SAP 2-SL 2-WIM 3-CEP 3-CIG 3-COP 3-SUB 3-TC 3-TIS 4-BEP 4-BIG 4-BUF 4-CAP 4-CEP 4-CIG 4-COM 4-COR 4-DD 4-DES 4-EPB 4-GRI 4-JOP 4-LAV 4-PEP 4-REP 4-RES 4-SUB 4-TC 4-TEP 4-VEC 4-VEG 4-VEP 4-VIP 4-VOP 5-BEL 5-DES 5-TCB 5-WES 6-CIT 6-PAN 6-PUL 6-REP 8-DIG 8-GAT 8-MIG 8-VAB GLV MLV TLV

Miscellaneous units:	399 499 (II) 994

Families:	1959 design 1972 design Mark 2-derived Mark 3-derived A-Train APT Aventra Civity Desiro Electrostar Juniper Networker TGV Tube¹ Velaro

British electric multiple units List of locomotives List of Diesel multiple units List of Electric multiple units List of Departmental multiple units Rolling stock of Network SouthEast 1: Grouping of different rolling stock types built to loading gauge of London Underground deep tube lines

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