Big Four

The Big Four, made up of the London North Eastern Railway (LNER), London Midland Scottish Railway (LMS), Southern Railway (SR) and the Great Western Railway (GWR).

LNER
The LNER inherited many types of Railcars from its component companies. They included Steam, diesel and electric powered models:
 * Ivatt GNR Rail Motor Coaches
 * Sentinel Steam Railcars
 * Clayton Steam Railcars
 * NER Petrol Inspection Cars
 * NER Petrol-Electric Autocars
 * NER Petrol Rail Motor Bus
 * NER Petrol Autocar
 * GCR Petrol-Electric Railcar
 * Armstrong-Whitworth Diesel-Electric Railcars
 * Metro-Vick-Cammell 58 seat Railcar
 * NER Tyneside Electric Multiple Units
 * LNER Tyneside Electric Multiple Units
 * BR Class 505
 * LNER-owned Northern Line Tube Stock
 * AM6 Electric Multiple Units
 * BR Class 506 (Ordered by LNER, Into service by BR)
 * Cruden Bay Tramway
 * Grimsby & Immingham Tramway

LMS

 * LMS Leyland Railcars
 * Armstrong-Whitworth Diesel-Electric Railcar
 * LMS Articulated Railcar
 * LNWR Electric Units
 * LYR Electric Units
 * Liverpool Overhead Railway Units
 * Mersey Railway Electric Units
 * BR Class 502
 * BR Class 503
 * MR electric units
 * Watford Joint Tube Stock

SR

 * 2-BIL
 * 2-HAL
 * 2-NOL
 * 2-PAN
 * 2-SL
 * 2-WIM
 * 3-SUB
 * 4-BUF
 * 4-COR
 * 4-DD
 * 4-GRI
 * 4-LAV
 * 4-RES
 * 4-SUB
 * 5-BEL
 * 6-CIT
 * 6-PAN
 * 6-PUL
 * Waterloo & City Stock
 * SR Class CP
 * SR Class CW
 * SR Class SL

GWR

 * GWR Railcars
 * GWR Railmotors