I still miss one very attractive tank car as a RTR model. That's the CONOCO or CONX paint scheme. Having studied the various prototypes, it occurred to me that CONX 8 and CONX 11 are not all that far off from the now readily available UTLX narrow frame versions. And there is an excellent picture for CONX 8 in NG Pictorial Vol. IV on page 132. CONX 11 is on page 133, but without the bold CONOCO lettering. Thus, CONX 8 was the logical choice in my case. The new Slim Gauge Cars book by Chris Lane has an additional picture, though from an earlier version without dome board and ladder. This is the first part of my report: Aside from an undecorated version of the NF tank car, one needs decals. To my knowledge, the only decals available for the CONOCO cars are made by Thinfilm. My main complaint here is the fact that the all white decals are printed on a very light grey backing paper. This makes trimming a somewhat tedious task. Also, my copy of #HOn 130, the ordering number for these decals, shows somewhat too much paint. Several of the numbers 8 are filled in. So I had to select the best of them. The bold CONOCO lettering is correct for the newer wide frame cars, I think. For my narrow frame car CONX 8, the spacing between the letters is a bit too narrow as can be seen in the attached** comparative picture. I had to underexpose it in order to make the printing show up sufficiently on the unused decal. So the letters had to be placed individually. There are some differences of the CONX cars compared to the UTLX ones. But they are such that the general appearance does not suffer much. And some adaptations can be made as well. The narrow frame is sufficiently similar to allow unaltered use. In fact, it seems that there must have been some differences among the various UTLX cars as well. At least, the frame of a HOn3 car by Blackstone is a bit different from the frame of a On3 version done by San Juan Car. And we can be pretty sure that both manufacturers put all their pride into producing an accurate rendition. The dome board is a bit longer on the UTLX cars, but I don't see an easy fix for that. Particularly, since the corresponding position of the tank braces can't be changed anyway. They are a bit farther apart than on the CONX cars. No problem for me, though. The side ladders on the UTLX cars go all the way up to the dome board, whereas they only go to the railing in the CONX cars, with a grab iron below the board instead. I snipped the ladders in such a way that they can later be glued to the railing, leaving a minor portion attached to the dome board. That part will serve as the missing grab iron. The tank bracing is attached to the bottom of the frame in the UTLX cars, whereas it is attached to the upper parts of the frame in the CONX cars. I removed the excess, using some glue drops to substitute as a clamp to the upper frame. Quite an acceptable solution in this scale, I think. I left all the other differences untouched, such as the different position of the brake line vent (I think that is what it is called?). I also did not feel to bother with the brake wheel that may not be fully prototypical here. The side ladders need to be removed for decaling. They need to be carefully pried lose from the tank. The attachment leaves two small holes in the tank that I tried to fill with a bit of glue before I started with the decals. As that part will be behind the ladders later, it does not matter much that the holes are still a bit visible in my case. I'll not use the original attachments though. ** For some reasons, my attempts to upload the intended attachments failed repeatedly with some error messages that don't make sense to me. Thus, I post this first part without pictures. Hope to get these on later, together with the rest of the report.