I did post last night but it seems to have disappeared into the ether! Yes Leleux is wrong - the sketch is on page 274 in the November 1958 MRC. And it's a different wagon to No. 17 above so that's a bonus! ! see that 17 is a 7 plank with end door whereas the wagon in MRC is No. 18 which, as Andrew said, was a 6 plank with no end door, tare wt 5-17-0, (though the brief text describes it as 7 plank, which it patently isn't). I can send a copy if you wish but it would have to be by snail mail as I can't persuade my printer to scan at the moment.
Chris KT