Diamond T tractors

[David_Hayward (RIP)]

May I ask for some guidance please? Am I right in saying that the Canadian and British 40-ton and 30-ton Tractors were all Models 980 or 981? The 40-tonners had a ballast box on the back and pulled the 24-wheeler Rogers trailers but there was also the semi-trailer arrangement for 30-ton Shelvoke & Drewry trailers. I have a photo from 1942ish showing the Trailmobile 20-ton semi-trailers which according to Canadian Military Vehicle Series : Europe WW2 P.146 was for attachment to Federal tractors. However the photos show DTs being used to tow these semi-trailers, so presumably the same Tractors could be used for either 20-ton or 30-ton semi-trailers? So far as I can see Candian order Diamond T 980 trucks were serial numbers # 9801709 to # 9802385. under contract numbers CDLV-332, CDLV-464, CDLV-493, and CDLV-509. The workshop manual is dated July 1942. Known US contract is W-938-QM-11594 with the manual dated October 1942, covering registrations USA 526859 to USA 529258

Please excuse my ignorance everyone but I know nothing about Diamond T, White, REO, Federal, Mack, Studebaker, FWD, save what I have gleaned from Wheels & Tracks and Bart Vanderveen's book. I can however help on GMC as I have a copy of the Parts Manual that lists all US military models.

I should add that the same series of photos show Canadian-order 970A G/S and Workshop trucks, and 15-cwt Dodge MCP units, plus some Ford F60L # 13 Cabs.