This page is a long term work in progress. The Road Construction Companies are not well documented and I am adding details as I find them. The information shown here is accurate but inevitably incomplete.
301st Road Construction Company RE
Reported in III Corps area in April 1917
302nd Road Construction Company RE
Landed at Le Havre 16 January 1917 (4 officers and 261 men)
Departed for Wanquetin 19 January 1917
Left XXII Corps for Canadian Corps 17 November 1918
303rd Road Construction Company RE
Landed at Le Havre 19 January 1917 (4 officers and 261 men)
Departed for Bailleulval 20 January 1917
Left IV Corps 24 July 1917
Transferred from First to Fifth Army 1 July 1918
At Radinghem in XIX Corps area in December 1918
304th Road Construction Company RE
Landed at Le Havre 19 January 1917 (6 men) then 24 January (4 officers and 248 men)
Arrived at Le Havre 24 January 1917: 4 officers, 248 men, 12 horses
Departed for Acheux 8 February 1917
Left V Corps area 14 June 1917
Transferred from XVIII Corps to II Corps (Ypres area) 28 October 1917
305th Road Construction Company RE
Arrived at Le Havre 5 February 1917 (3 officers, 260 men, 12 horses)
Departed for Acheux 8 February 1917
With XIX Corps located at grid location G.14.a.9.8 in early August 1917 then H.7.a.5.6 on 11 August
Moved to Acheux 8 February 1917
306th Road Construction Company RE
Arrived at Le Havre 5 February 1917: 4 officers, 261 men, 12 horses
Moved to Aubigny 6 February 1917
The war diary of this company exists but only covers June 1917 when it reports working in the area of Acq, Haute Avesnes, Habarcq and Larisset areas, with a detachment working at St. Nicolas.
In December 1918 the company was split and working on salvage in two places in XIX Corps area: Rue de Lille in Ypres and at Bailleul
306th Road Construction Company RE
Arrived at Le Havre 11 February 1917: 4 officers, 260 men, 10 horses
307th Road Construction Company RE
Arrived at Le Havre 11 February 1917 (4 officers, 260 men)
Left Le Havre 15 February 1917
308th Road Construction Company RE
Arrived at Le Havre 5 February 1917: 4 officers, 261 men, 12 horses
Moved to Lestrem 12 February 1917
Transferred from First to Fifth Army 1 July 1918
Location reported as Sin 24 March 1919.
309th Road Construction Company RE
Arrived at Le Havre 5 February 1917: 4 officers, 261 men, 12 horses
Departed for Bouzincourt 8 February 1917
Transferred from II Corps to 1st ANZAC March 1917
27 May 1917 left V Corps to join Second Army
310th Road Construction Company RE
Arrived at Le Havre 13 February 1917 (3 officers, 260 men)
311th Road Construction Company RE
Arrived at Le Havre 15 February 1917: 4 officers, 240 men, 10 horses
Moved to Belair 18 February 1917
Reported in III Corps area in April 1917
312th Road Construction Company RE
Arrived at Le Havre 22 February 1917: 2 officers, 248 men. An additional officer, 10 men and 10 horses arrived two days later
Moved to Dernancourt 26 February 1917
Moved to Albert 5 March 1917
With XIX Corps located at grid location H.7.a.7.6 in early August 1917 then G.14.a.9.8 on 11 August
313th Road Construction Company RE
IX Corps reported company at Estrées-en-Chaussée on 15 October 1918
314th Road Construction Company RE
Joined XXII Corps from Canadian Corps 25 October 1918
315th Road Construction Company RE
Moved to Albert and into II Corps area 2 March 1917
Transferred from II Corps to 1st ANZAC March 1917
317th Road Construction Company RE
Transferred from XVIII Corps to II Corps (Ypres area) 28 October 1917
Moved from Fourth Army to Fifth Army by rail soon after January 1918, then being placed under XVIII Corps at Ham.
318th Road Construction Company RE
Reported to be at Estree-Cauchy by XVIII Corps in May 1918
319th Road Construction Company RE
Raised at Advanced Horse Transport Depot at Abbeville 14 April 1917
3 officers and 169 men left for Bailleul for duty with II ANZAC 23 May 1917
Detailed war diary exists covering whole period up to September 1918
RE Companies numbered between these Road Construction Companies were Quarrying units
330th Road Construction Company RE
Arrived at Le Havre 13 March 1917: 5 men, 10 horses
Moved to Meaulte 22 March 1917
Reported in III Corps area in April 1917
Left XXII Corps at Mont Noir for Fifth Army 18 March 1918
Transferred from XVII to XIII Corops 26 November 1918.
331st Road Construction Company RE
Arrived at Le Havre 2 June 1917: 3 officers, 256 men, 10 horses
Departed for Le Brebis 5 June 1917
Reported to be at Aix-Noulette by XVIII Corps in May 1918
Left I Corps for Auberchicourt 10 March 1919.
332nd Road Construction Company RE
Landed at Le Havre from “Huntsman” on 4 April 1917, consisting of 3 officers and 256 men
Moved from Le Havre to Poperinghe 19 June 1917 and came under command of XIV Corps next day, working to orders given by the Assistant Director of Roads of Fifth Army
Transferred from II to IV Corps 2 July 1917
Transferred from XVIII Corps to II Corps (Ypres area) 28 October 1917
Moved from Fourth Army to Fifth Army by rail on 30 January 1918, then being placed under III Corps at Chauny
333rd Road Construction Company RE
Arrived at Le Havre 2 March 1917: 4 officers, 256 men, 10 horses. An additional 4 men arrived next day
Fifth Army stated it was expected to arrive at Courcelles
Moved to Beaussart 6 March 1917 under V Corps
Moved to Acheux 7 March 1917
10 April 1917 moved to Contay on transfer to Fourth Army
334th Road Construction Company RE
Arrived at Le Havre 2 March 1917: 3 officers, 255 men, 10 horses. An additional 4 men arrived next day
Fifth Army stated it was expected to arrive at Authuille
Moved to Albert 7 March 1917 arrived next day and came under II Corps but soon to V Corps
27 May 1917 left V Corps to join Second Army
335th Road Construction Company RE
Arrived at Le Havre 13 March 1917: 3 officers, 254 men, 10 horses
Moved to Bailleul 21 March 1917
Left XXII Corps at Abeele for XIX Corps 19 February 1918
Transferred from XVII to XIII Corops 26 November 1918.
336th Road Construction Company RE
Arrived at Le Havre 17 March 1917: 3 officers, 254 men, 10 horses
Moved to Doullens 26 March 1917
337th Road Construction Company RE
Arrived at Le Havre 27 March 1917: 3 officers, 260 men, 9 horses
Left Le Havre 5 April 1917
Transferred from XI Corps to III Corps in October 1918
Left I Corps for Lewarde 12 March 1919.
338th Road Construction Company RE
Arrived at Le Havre 4 April 1917: 3 officers, 256 men, 10 horses
Left Le Havre 8 April 1917
Transferred from XI Corps to III Corps in October 1918
339th Road Construction Company RE
Arrived at Le Havre 14 April 1917: 1 officer, 56 men, 10 horses. Additional 2 officers and 196 men arrived next day
Moved to Steenwerck 17 April 1917
Left XXII Corps at Abeele for Third Army 23 February 1918
Transferred from XVII to XIII Corops 26 November 1918.
340th Road Construction Company RE
Arrived at Le Havre 15 April 1917: 1 officer, 56 men, 10 horses. Additional 2 officers and 200 men arrived next day
Moved to Ouderdom 19 April 1917
Reported attached to 47th (London) Division July 1917
7 February 1918: left XXII Corps area for Fifth Army
341st Road Construction Company RE
Left Le Havre 24 April 1917
Left Canadian Corps to join XXII Corps at Ecoivres 31 August 1918
342nd Road Construction Company RE
Arrived in VIII Corps area 2 May 1917
343rd Road Construction Company
Arrived at Le Havre 4 May 1917: 3 officers and 256 men, 10 horses
Departed for Aubigny 7 May 1917
With XIX Corps located at grid location H.8.c.5.9 in August 1917
344th Road Construction Company RE
Arrived at Le Havre 13 May 1917: 2 officers, 256 men, 10 horses
Left Le Havre 15 May 1917
Arrived in VIII Corps area 16 May 1917
Moved from Fourth Army to Fifth Army by rail on 8 January 1918, then being split to locations at Ham and Aubigny
Transferred to IX Corps and located at 62C/R.15.d on 20 October 1918. Five days later, at Fresnoy-le-Grand.
345th Road Construction Company RE
Arrived at Le Havre 25 May 1917: 3 officers, 258 men, 10 horses
Moved to Essars 27 May 1917
Left XXII Corps at Zuytpeene for First Army 9 May 1918
Transferred from First to Fifth Army 1 July 1918
346th Road Construction Company RE
IX Corps reported company at location 62B/H.34.a.8.6 on 16 October 1918.
347th Road Construction Company RE
Transferred from XVII to XIII Corps 26 November 1918.
Other information
Newspapers in January 1917 ran articles explaining that boys aged 17 could voluntarily enlist into the RCCs and after short training would be sent to France. On reaching 18 they would be returned home for training as infantry.
Sources
War diary of Le Havre Base
War diary of First Army Adjutant (WO95/191)
War diary of 306 RCC (National Archives WO95/4057)
War diary of 319 RCC (also WO95/4057)