Most of the SR&RL content on the DLs was updated to TB 3.5 which is TS12. I dl'd the 3 SR&RL locos from the DLS and the pic below shows what I see in TRS19 SP5. They load without errors but have some warnings mostly about textures. No 15 and tender look the best and I notice only 1 or 2 minor things that might texture problems. Loco 16 looks about the same but 18 and tenders for 16 and 18 do have some significant problems.
All 3 locos lack a working cab and custom script so running in cab mode is by using the hud sliders only. All 3 tenders lack water and fuel queues so running in cab mode really isn't an option without some config mods. 15 is the larger and more powerful. 16 & 18 are sisters or at least close enough. The same espec is used for all 3 and I found it a bit sluggish and sensitive to the cutoff setting used.
Maybe the textures can be fixed or the locos DL from other sources. There are a number of other SR&RL rolling stock items on the DLS but I didn't dl or check any of them.
I have my own versions of theses locos from many years back that I modified with custom scripts and especs and I've used them up to TS12 and really enjoyed running them.
Bob Pearson