The codes that appear on timetables to tell you what the operator is.

AR              Alliance Rail

AW             Arriva Trains Wales

CC              c2c

CH              Chiltern Railways

CS              Serco Caledonian Sleeper

EM              East Midlands

GC              Grand Central

GN              Govia Thameslink Railway (Great Northern)

GR              Virgin Trains East Coast

GW             Great Western Railway

GX              Gatwick Express

HT              Hull Trains

HX              Heathrow Express

IL                Island Line

LE              Abellio Greater Anglia

LM              West Midlands Trains

LO              Transport for London

ME             Merseyrail

NT              Northern Rail

NY             North Yorkshire Moors Railway

SE             South Eastern Trains

SN             Southern

SR             Scotrail

SW            South Western Railway

TL             Govia Thameslink Railway

TP             First TransPennine Express

VT             Virgin West Coast

WR            West Coast Railway

XC             Cross Country

XR             Crossrail