Help needed with Great War service numbers

I'm researching my great grandfather's war service and have reached a stumbling block. Does anyone know why there are different letter prefixes for service numbers. For example his number is T-14558, but have found others with the letters M2, TS, DM2. Is there any relavance to these letters? Any help much appreciated. Thanks, Pike.
During WW2 members of the RASC had either a T or S prefix, denoting transport or supply, not sure if it was the same during WW1, but it looks likely.
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It sounds like WW1 Army Ordanance corps prefixe it could also be a territorial force prefix, if it is T1-number T2-number T3-number orT4-number it is an Army Service Corps horse transport prefix ie drivers, wheel wrights, farriers and blacksmiths etc
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The prefixes are:

Covered in detail at

A - ASC (Old Special Reserve).

A - KRRC (Early wartime recruits).

A - RSF, Cameronians & AOC.

B - 26/RF (City of London Bankers).

B - KRRC, Rifle Brigade & Cameronians.

C - KRRC (16th Battalion onwards).

C - 1/R Munster Fus. (Garrison Bn.), Middx. Regt. & Rifle Brigade.

CHT - Corps of Horse Transport - ASC.

CMT - Corps of Motor Transport - ASC.

D - Dragoons & Dragoon Guards.

DG - Dragoon Guards.

DM - Driver MT - ASC.

E - 17/RF (Empire Battalion).

F - 17 & 23/Middx. Regt. (Football Battalions).

G - 1, 2 & 3/RIF (Garrison Battalions).

G - Prefix found on various Home Counties regiments (Service Battalions).

GS - See above.

GS - Cavalry regiments (War service only).

GS - General Service.

H - Hussars.

J - 38, 39 & 40/RF (Jewish Battalions).

K - Royal Lancaster Regt. (The King's Own) & Cambridgeshire Regt.

L - Lancers.

L - Prefix found on various Home Counties regiments (Regulars).

L - 3/SWB.

M1 - MT Section - ASC.

M2 - Electricians - ASC.

MS - Mechanical Specials (trade) - ASC.

MT - Mechanical Transport (trade) - ASC.


O - Rifle Brigade.

P - Military Police.

P - Dragoon Guards.

PS - 18, 19, 20 & 21/RF and 16/Middx. Regt. (Public School Battalions).

PW - 18, 19 & 26/Middx. Regt. (Public Works Battalions - later Labour Corps).

R - Remount Section - ASC.

R - KRRC (later recruits up to 16th Bn.), also Manchester Regiment.

RX - Remount Section - ASC.

S - Supply - ASC.

S - Highland Regiments (wartime enlistments).

S - Home counties regiments (3rd [Militia] Battalions).

S - Rifle Brigade, Dorset Regt., R Munster Fus., AOC, RA & RAMC.

SB - 10/RF (City of London Stockbrokers Battalion).

SD - 11, 12 & 13/R Sussex Regt. (South Downs Battalions).

SE - Army Veterinary Corps (Special Enlistment for duration).

SPTS - 23 & 24/RF (Sportsmans' Battalions).

SS - Supply Special (trade) - ASC

STK - 10/RF (City of London Stockbrokers Battalion).

T1, T2, T3 & T4 - Horse Transport - ASC.

T - Army Ordnance Corps.

T - Territorial Force.

TF - Territorial Force.

TR - Training Reserve - ASC.

TS - Transport Specials (trade) - ASC.

TSR - Transport Special Reserve - ASC.

W - 13/Cheshire Regt. (Wirral).

W - 38th (Welsh) Divn. Royal Artillery.

WR - Royal Engineers (Waterways & Railways).

Y - KRRC (early wartime enlistments).

Z - Rifle Brigade.

The list from the Royal Naval Volunteer Reserve:-

AA Anti-Aircraft
B or BZ Bristol Division
C or CZ Clyde Division
E Birmingham Electrical Volunteers
KP, KW, KX Crystal Palace (entered from Kitchener's Army)
L or LZ London Division
M or MZ Mersey Division
MB Motor Boat Reserve
MC Mine Clearance Service
R Royal Naval Division
PZ Crystal Palace (entered from civil life or from the RN)
S or SZ Sussex Division
SWS Shore Wireless Service
T or TZ Tyne Division
WZ Wales Division

Regular service from 1908 to 1923

J 1 - J 110000 Seamen and Communication ratings
M 1 - M 38000 Engine Room Artificers
K 1 - K 63500 Stokers
M 1 - M 38000 Artisans and Miscellaneous
M 1 - M 38000 Sick Berth Staff and Ship's Police
L 1 - L 15000 Officer's Stewards, Officer's Cooks and Boy Stewards
Thanks everyone, especially Ventress for such comprehensive knowledge.

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